Complete Guide to 70mm Film

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MCB18

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I just joined Photrio, but largely because of this thread. I've been reading a bunch (not all) of the website - first, thank you, Zach! I found this thread because I just stumbled upon a Pentax 645 (which I have long wanted) that has a 70mm back (and nothing else - not even the extender for the eyepiece, nor a grip). I didn't intend to get into 70mm, but because it's there, why not?

I'm a bit confused by the site's treatment of film stocks, in particular the 65/70 differences as they relate to the Pentax 645 70mm insert. My confusion is specifically around what film to start with. I don't really want to modify the insert right away, but would like to shoot 70mm first, see if it's even something I want to keep doing. What should I be looking for in terms of film stocks? I see Type I & II perfs discussed in this thread, and it seems if I read things correctly that unperfed film won't work in this insert. So should I just be looking for basic 70mm motion picture film and not worrying about anything else? I would like to shoot color, but am not opposed to BW (I am set up for color processing right now - C41 or ECN-2, either one), but have not processed BW myself since high school many many many moons ago.

Sorry if this is already out there - admittedly, I may be missing some comprehension.

Thanks!

You’ll need to look for 70mm type II perfs. That film is unfortunately very hard to find now, the last bits of NOS Aviphot with type 2 on eBay have dried up. Occasionally you’ll get Plus-X or others, but they’re gonna go for a lot, and any color is going to be a big gamble.

I believe 65mm movie film will work in your back, but you will loose the automatic frame spacing and you may have to override any double exposure prevention mechanisms. The film is also offset to one side of the reel to avoid interfering with the sprocket wheel, so perfs will show up in the frame.

70mm movie print stock will not work in a 70mm back that needs perfs, 70mm print stock has perforations placed more toward the middle of the film and this messes up the sprocket counter.

Hope this helps!
 
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I just joined Photrio, but largely because of this thread. I've been reading a bunch (not all) of the website - first, thank you, Zach! I found this thread because I just stumbled upon a Pentax 645 (which I have long wanted) that has a 70mm back (and nothing else - not even the extender for the eyepiece, nor a grip). I didn't intend to get into 70mm, but because it's there, why not?

I'm a bit confused by the site's treatment of film stocks, in particular the 65/70 differences as they relate to the Pentax 645 70mm insert. My confusion is specifically around what film to start with. I don't really want to modify the insert right away, but would like to shoot 70mm first, see if it's even something I want to keep doing. What should I be looking for in terms of film stocks? I see Type I & II perfs discussed in this thread, and it seems if I read things correctly that unperfed film won't work in this insert. So should I just be looking for basic 70mm motion picture film and not worrying about anything else? I would like to shoot color, but am not opposed to BW (I am set up for color processing right now - C41 or ECN-2, either one), but have not processed BW myself since high school many many many moons ago.

Sorry if this is already out there - admittedly, I may be missing some comprehension.

Thanks!

Film4eva- I'm the moron that modded my 70mm back. It does not affect shooting 'normal' still photo 70mm film. There's just enough slop that you can file outer edge of the sprocket teeth juuuuuuust a bit to get 65mm to run through it. (65mm sprockets are set a bit further inside the film than 70mm). As a rough guide, you will lose what's in the viewfinder in the 'notch' above the LED readout. And you will get sprocket pics. I got LUCKY on the eyepiece, someone listed one on ebay. You might be able to use a right angle eyepiece for your viewing. Not 100% sure if it clears the back, but I was going to try that.

Do you have 70mm film cartridges? You will need two. They can be cheap or overpriced, depending where you find them.

the hardest part is once you've shot 15' of film, no easily findable reel will accommodate that. So you can cut it in half, but you always cut the best photo in the roll.

If you'd like some 70mm B&W to try, I think we can talk since I have PlusX Aero & Aviphoto stashed. (But I don't really want to give up my 70mm carts.)
 
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film4eva-
Also feel safe ordering from MCB818, I've bought from him, and he's done several Ukrainian custom-film group-buys here.
 

Sirius Glass

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I just joined Photrio, but largely because of this thread. I've been reading a bunch (not all) of the website - first, thank you, Zach! I found this thread because I just stumbled upon a Pentax 645 (which I have long wanted) that has a 70mm back (and nothing else - not even the extender for the eyepiece, nor a grip). I didn't intend to get into 70mm, but because it's there, why not?

I'm a bit confused by the site's treatment of film stocks, in particular the 65/70 differences as they relate to the Pentax 645 70mm insert. My confusion is specifically around what film to start with. I don't really want to modify the insert right away, but would like to shoot 70mm first, see if it's even something I want to keep doing. What should I be looking for in terms of film stocks? I see Type I & II perfs discussed in this thread, and it seems if I read things correctly that unperfed film won't work in this insert. So should I just be looking for basic 70mm motion picture film and not worrying about anything else? I would like to shoot color, but am not opposed to BW (I am set up for color processing right now - C41 or ECN-2, either one), but have not processed BW myself since high school many many many moons ago.

Sorry if this is already out there - admittedly, I may be missing some comprehension.

Thanks!

Welcome to Photrio!
 

film4eva

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Wow, thanks for all these great replies so quickly!

@MCB18 - Thanks for the link to the film stock for sale. Again, I think that the unperfed stuff won't work in a 645 insert, but I'll keep learning and maybe go for it if I learn differently.

@Sonynolta User - Hah! Moron isn't the term I had in mind, but thanks for your experience notes there. I was reviewing the instructions at shoot70mm.com, and it does indeed seem straightforward. I just paid for two standard Kodak canisters today, but it seems I will need to buy the Mercury Max Offset 65mm spools to drop in for 65mm in the 645, once the insert is modded. I guess I'm happy enough with that. As for the eyepiece extender, I have a search saved on eBay, and was also thinking that a right-angle might do the trick. I'll also check out the eyepiece as it is, see if there's a way to homebrew an extender in the meantime. Who knows, a couple small pieces of glass, and a 3d printed housing might just work. For developing, it seems that there are tanks and reels available that I can use, or, as you say, I can risk cutting in the right place. Or, I guess, just load a shorter length to start with. And thanks for the thought to get me some 70mm, but maybe it'd be easier for me to start with 65mm color after all.

@Sirius Glass - Thanks again! I saw your reply to my intro post, too, but figured I wouldn't spam too much.

I guess that the bottom line for me is to just go with 65mm as soon as possible, and if I come across some 70, it sounds like I might try it as a lark.
 
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rhizomeblur

rhizomeblur

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I just joined Photrio, but largely because of this thread. I've been reading a bunch (not all) of the website - first, thank you, Zach! I found this thread because I just stumbled upon a Pentax 645 (which I have long wanted) that has a 70mm back (and nothing else - not even the extender for the eyepiece, nor a grip). I didn't intend to get into 70mm, but because it's there, why not?

I'm a bit confused by the site's treatment of film stocks, in particular the 65/70 differences as they relate to the Pentax 645 70mm insert. My confusion is specifically around what film to start with. I don't really want to modify the insert right away, but would like to shoot 70mm first, see if it's even something I want to keep doing. What should I be looking for in terms of film stocks? I see Type I & II perfs discussed in this thread, and it seems if I read things correctly that unperfed film won't work in this insert. So should I just be looking for basic 70mm motion picture film and not worrying about anything else? I would like to shoot color, but am not opposed to BW (I am set up for color processing right now - C41 or ECN-2, either one), but have not processed BW myself since high school many many many moons ago.

Sorry if this is already out there - admittedly, I may be missing some comprehension.

Thanks!

First off, you're very welcome! It's been exciting to help so many more people get started with 65/70mm photography!

For the Pentax 645, 70mm motion picture film won't work. You need either 65mm motion picture film (using our easy modification of your back and our "max offset" spools) or 70mm Type 2 perf film. Finding the latter in color is possible, but fairly rare on Ebay these days. BW is out there more frequently. I'd say the easiest for you is 65mm color, since you're already set up for that, and it's the most amazing film available today--go for it! I love shooting 65mm film with the Pentax...
 

film4eva

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Hey Zach, yeah, this is what I gathered from the others already, but thanks for chiming in. I'll get two max offset spools from your store, and some film and see how it goes. I may just send the initial roll out for developing until I can get the right equipment (y'know, just to really be sure before committing 😆). Blue Moon will process 65mm with remote, I'm led to understand, as well as your lab.

Currently I'm using a couple of Paterson type tanks big enough to hold 1 120 roll or 2 135 rolls at a time. I also process my own 16mm/110 on occasion in these same tanks with 3D printed spools found on Etsy (really good, in case anyone else is a fan of subminiature!).

As cool as the submin cameras are to shoot, I'm very eager to try going the opposite direction, image-wise. 😂
 

outwest

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I suppose I should dig out my Hassie 70mm back and load some cartridges with slightly expired Ilford FP4 (no +) film and get out the big SS reel and tank. Check with me again in a couple of years.
 

Jan-Peter

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Hello, Zach - and the others, e.g. film4eva - et.al.;

my name is Jan-Peter from Southern Germany - and first of all I want to thank you very much for this thread! - Here I want to give my report on the 70-mm-experience:

In summer 1985, long time ago, I got my Hasselblad 500 C/M brand new with the Planar CF-80mm, the Distagon CF-50mm, the Sonnar CF-150mm and three A.12 magazins/backs. - By the time I added up with the legendary Distagon CF-50mm und the Tessar CF-350mm, as well as several other back, such as A.16 and A.24.

Two years ago, in autumn/fall 2022 I fnally got hold of my first A.70 back from a daughter of someone who gave up analogue photography that would include 7 cartridges filled with very oulde Plus-X-70mm-film. - I had this A.70 back serviced by Peter Gierens a very nice guy near Cologne in Germany who has good knowledge and is trading real fair.

Now I had to develop these films. I took two Paterson spirals, vice-versa, to fit the 70mm distance between them and had the usual go with Ilford ID-11, 1+3, 22°C an approx. 16 mins. They came out real well though with a fairly darkened mask. - However this method need a good patience to feed the reels, though I never had the problem that parts of the film would stick together during the processing, no wheeling, but "shaking" the tanks. - The disadvantage of using the usual Paterson reels is that you have to cut a full lenght film of approx. 5 mtrs twice meaning that you lose two prints and wich you cannot really predict what prints these will be - though obiously they will not be on the end or beginning or in the middle of a 5 mtrs-lenght 70mm-film.

After drying these 70mm-films with pegs in front of a window leaving them for maybe three or four hours I cut them in 3-prints lenghts and put them in these usual pergamin sleeves or "pages" DIN-4-sized. They just fit in there.

Of course I wanted to enlarge the negatives. - I have two Durst BW-605 enlargers, one at our home at LAke Constance, the other in our second home on Italian Lake Como, actually Lago Mezzola, VAl CHiavenna - and also a Durst Laborator 138. - I got hold of another/second negative carrier for the Durst 605 and took out the format holders for 35mm and 120 negatives - thus I can freely move the 70mm-film in the carrier and can enlarge prints nearly any size - actually I enlarge small sizes for the album - and 12x12" and 20x20" sizes for framing - and it works really well.

Enlarging with the Durst Laborator 138 is a lot more comfortable with large sizes - however I have no solution for the "extra-wide" 70mm; I think I will get an extra Lapfe mask probably from someone who can do these on a 3D-printer.

As I did proceed really well I bought some of the large 85 mtrs. rolls of the Agfa Aviphot 200, perforated, from this seller in India - and have very good results in Ilford ID-11, 1+3, 22°C and 22 mins - or also 20°C and 28 mins. - The big advantage of this Aviphot that it has an enlarged range for infrared photography! -Thus you can take a photo as a usual b&w photo as well as an infrared photo.

However for this moment I have two questions: (a) Recently I got hold of four 45 mtrs rolls of this Aviphot 200 films which is obviously un-perforated. - When I use my standard Hasselblad A.70 back I can frankly use it as well however would not have the counter to run along - or won't it work at all? - (b) If I simply may directly ask: Is this Mercuy Murnau 100 70-mm film the same as the Rollei Retro 80S - just changing the name - or is this Murnau film a newly or freshly coated emulsion on a film basis? - I know the Rollei Retro 80S fairly well and have entirely no objections.

Item: I would join everyone in using 70mm film indeed - and want to thank Zach very much indeed for this wonderful encouraging and informative thread - and his website!!

Jan-Peter
 
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MCB18

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Hello, Zach - and the others, e.g. film4eva - et.al.;

my name is Jan-Peter from Southern Germany - and first of all I want to thank you very much for this thread! - Here I want to give my report on the 70-mm-experience:

In summer 1985, long time ago, I got my Hasselblad 500 C/M brand new with the Planar CF-80mm, the Distagon CF-50mm, the Sonnar CF-150mm and three A.12 magazins/backs. - By the time I added up with the legendary Distagon CF-50mm und the Tessar CF-350mm, as well as several other back, such as A.16 and A.24.

Two years ago, in autumn/fall 2022 I fnally got hold of my first A.70 back from a daughter of someone who gave up analogue photography that would include 7 cartridges filled with very oulde Plus-X-70mm-film. - I had this A.70 back serviced by Peter Gierens a very nice guy near Cologne in Germany who has good knowledge and is trading real fair.

Now I had to develop these films. I took two Paterson spirals, vice-versa, to fit the 70mm distance between them and had the usual go with Ilford ID-11, 1+3, 22°C an approx. 16 mins. They came out real well though with a fairly darkened mask. - However this method need a good patience to feed the reels, though I never had the problem that parts of the film would stick together during the processing, no wheeling, but "shaking" the tanks. - The disadvantage of using the usual Paterson reels is that you have to cut a full lenght film of approx. 5 mtrs twice meaning that you lose two prints and wich you cannot really predict what prints these will be - though obiously they will not be on the end or beginning or in the middle of a 5 mtrs-lenght 70mm-film.

After drying these 70mm-films with pegs in front of a window leaving them for maybe three or four hours I cut them in 3-prints lenghts and put them in these usual pergamin sleeves or "pages" DIN-4-sized. They just fit in there.

Of course I wanted to enlarge the negatives. - I have two Durst BW-605 enlargers, one at our home at LAke Constance, the other in our second home on Italian Lake Como, actually Lago Mezzola, VAl CHiavenna - and also a Durst Laborator 138. - I got hold of another/second negative carrier for the Durst 605 and took out the format holders for 35mm and 120 negatives - thus I can freely move the 70mm-film in the carrier and can enlarge prints nearly any size - actually I enlarge small sizes for the album - and 12x12" and 20x20" sizes for framing - and it works really well.

Enlarging with the Durst Laborator 138 is a lot more comfortable with large sizes - however I have no solution for the "extra-wide" 70mm; I think I will get an extra Lapfe mask probably from someone who can do these on a 3D-printer.

As I did proceed really well I bought some of the large 85 mtrs. rolls of the Agfa Aviphot 200, perforated, from this seller in India - and have very good results in Ilford ID-11, 1+3, 22°C and 22 mins - or also 20°C and 28 mins. - The big advantage of this Aviphot that it has an enlarged range for infrared photography! -Thus you can take a photo as a usual b&w photo as well as an infrared photo.

However for this moment I have two questions: (a) Recently I got hold of four 45 mtrs rolls of this Aviphot 200 films which is obviously un-perforated. - When I use my standard Hasselblad A.70 back I can frankly use it as well however would not have the counter to run along - or won't it work at all? - (b) If I simply may directly ask: Is this Mercuy Murnau 100 70-mm film the same as the Rollei Retro 80S - just changing the name - or is this Murnau film a newly or freshly coated emulsion on a film basis? - I know the Rollei Retro 80S fairly well and have entirely no objections.

Item: I would join everyone in using 70mm film indeed - and want to thank Zach very much indeed for this wonderful encouraging and informative thread - and his website!!

Jan-Peter

Hi, I can answer a couple of your questions.

Yes, you can use unperforated film in the A70 back, you do however need a part from eBay that will replace the sprocket teeth with a rubber o-ring on a wheel, this will count the film accurately.

As far as the 70mm Zach sells, I have bought this same film, and am currently organizing another large batch purchase of this same film. I believe it is FN-64 from Astrum, which I have found to most likely be Aviphot 80/Rollei Retro 80S. This is fresh film, I can confirm that much. It works extremely well in Rodinol.

Wish I had the infrastructure to develop bulk rolls of 70mm film, I have a long roll 70mm back for my RB and it’s killing me that I can’t justify ordering 150’ of the stuff this round.
 

MCB18

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rhizomeblur

rhizomeblur

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I suppose I should dig out my Hassie 70mm back and load some cartridges with slightly expired Ilford FP4 (no +) film and get out the big SS reel and tank. Check with me again in a couple of years.

Ha, I highly recommend the "+" in FP4+, but have tried it without, and though the results might be funky, I encourage you to give it a try anyway!
 
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rhizomeblur

rhizomeblur

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However for this moment I have two questions: (a) Recently I got hold of four 45 mtrs rolls of this Aviphot 200 films which is obviously un-perforated. - When I use my standard Hasselblad A.70 back I can frankly use it as well however would not have the counter to run along - or won't it work at all? - (b) If I simply may directly ask: Is this Mercuy Murnau 100 70-mm film the same as the Rollei Retro 80S - just changing the name - or is this Murnau film a newly or freshly coated emulsion on a film basis? - I know the Rollei Retro 80S fairly well and have entirely no objections.

Item: I would join everyone in using 70mm film indeed - and want to thank Zach very much indeed for this wonderful encouraging and informative thread - and his website!!

Hi Jan-Peter,

Welcome to the thread and to 70mm! You'll have a lot of fun!

To shoot with unperforated film in your A70, you need an "all perf" wheel to replace your sprocket wheel. Changing from one to the other takes only a minute, and is reversible. Mercury Works sells this quite inexpensively here.

I can't confirm who manufactures Murnau 100 film; sorry about that! I have not tried FN-64.

Once you have the all-perf wheel installed in your A70, you can use all sorts of film. The state of the art is to shoot 65mm motion picture film. Mercury Works developed that workflow to vastly increase the options for long-roll shooters. You can read much more about this as www.shoot65mm.com

For developing, if you get tired of the 5ft sections in Paterson reels, Mercury Works makes a 13ft long roll developing tank.

Have fun!

Cheers,
Zach
 

film4eva

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Zach,

I just finally bought a roll of 65 from your site, after finding an eyepiece extender for the 645 70mm insert. I have read the news that Kodak will stop sales of Vision 3 to all but bona fide motion picture productions, though I don't know the details. Can you say whether or not Mercury is affected by that? And if so, will you be exploring alternatives like the Ilford annual special order (for example)?

Thanks!
 
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rhizomeblur

rhizomeblur

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Zach,

I just finally bought a roll of 65 from your site, after finding an eyepiece extender for the 645 70mm insert. I have read the news that Kodak will stop sales of Vision 3 to all but bona fide motion picture productions, though I don't know the details. Can you say whether or not Mercury is affected by that? And if so, will you be exploring alternatives like the Ilford annual special order (for example)?

Thanks!

Mercury Works has not been affected by this, for a number of reasons. We work within the motion picture industry.

Separately, we also have our own line of 70mm BW film. And we also work with Ilford to deliver 70mm to folks annually. We delivered a lot of 70mm HP5+ to customers just last month! (And incidentally, still have some fresh 46mm available for sale.)

As long as you are subscribed to our email announcements list and select "65mm" and "70mm" as format options when you sign up, you'll receive any future announcements about film availability!

Cheers,
Zach
 

Ben Hutcherson

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Mercury Works has not been affected by this, for a number of reasons. We work within the motion picture industry.

Separately, we also have our own line of 70mm BW film. And we also work with Ilford to deliver 70mm to folks annually. We delivered a lot of 70mm HP5+ to customers just last month! (And incidentally, still have some fresh 46mm available for sale.)

As long as you are subscribed to our email announcements list and select "65mm" and "70mm" as format options when you sign up, you'll receive any future announcements about film availability!

Cheers,
Zach

I had meant to ask you about this, so thanks for confirming continued 65mm availability! I'd hate to fall in love with Vision 250D in my Hasselblad and then find out once my current ~90ft is gone, I can't get any more...
 

film4eva

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Mercury Works has not been affected by this, for a number of reasons. We work within the motion picture industry.

Separately, we also have our own line of 70mm BW film. And we also work with Ilford to deliver 70mm to folks annually. We delivered a lot of 70mm HP5+ to customers just last month! (And incidentally, still have some fresh 46mm available for sale.)

As long as you are subscribed to our email announcements list and select "65mm" and "70mm" as format options when you sign up, you'll receive any future announcements about film availability!

Cheers,
Zach
This is excellent news! Thanks so much for your answer. I'm glad I won't be forced to buy lots of film before I'm quite convinced that this is a format I want to stick with.
 

MCB18

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Just got my hands on an RH50 back, and an adapter for use on the RB67 is getting printed. A 15 ft 70mm spiral that I can use in something like a paint can ir bucket in the dark is also getting printed.. I also bought some 70mm techpan and 2 more cassettes from another forum member, and am planning on buying myself a 150’ roll of Foto-100 from Astrum soon as well.
 

jimgalli

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Don’t forget all the cheap (ish) Aviphot 70mm film available on eBay. Very nice film to work with. I test Cirkut gears / lenses with it. Also slides into a piece of 2” sewer pipe easy for development.
 

MCB18

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Don’t forget all the cheap (ish) Aviphot 70mm film available on eBay. Very nice film to work with. I test Cirkut gears / lenses with it. Also slides into a piece of 2” sewer pipe easy for development.
Oh I’ve shot plenty, and I have gotten good results. Unfortunately not as cheap anymore. $80 for 100 ft of 2005 dated film. I used to buy 2 packs of 150 ft cans dated 12/2012 for $100… yeah fresh stuff is more expensive but not expensive enough that I feel like the expired stuff is worth it. Hell I can even get rolls of fresh 7.5” and 9.5” film!
 
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Nokton48

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SONY DSC by Nokton48, on Flickr

I've been working on shooting 70mm film again. Have decided best possible for now is the Graflex RH-50 70mm Film Back, I have two in house. One is now loaded with Kodak 2485 Recording Film (Uber high-speed low light emulsion) Type II perfed. Other RH-50 is loaded with fresh (bought frozen from B&H close-out) Kodak Tri-X Professional 70mm Unperfed. The RH-50 dosent care if it's perfed or unperfed (YAY) and takes standard Kodak 70mm film cartridges, so it's daylight reloadable (YAY). On my hack modded Paterson 70mm film reel I can load eighteen exposures, format is roughly 6x7cm so pretty nice to shoot. It was fun to work all this out. I prefer the Graflex 70mm back over the Beatty Coleman Transet 70mm back, at least for now. I also have a couple of tan Linhof Technika 70mm backs which I will investigate again soon. The initial loaded test roll of eighteen exposure 2485 Recording Film will be tested at nominal EI 1600 (a total guess) and bracketed in full stops each way. I will process in straight Acufine 800ml in Paterson System 4 single reel tank. Acufine recommended by Bill Pierce decades ago for maximum highlight nuance and detail. This film can be rated up to EI 8000 we will see if developed in Kodak 857 Special Developer. Another plus is that the 70mm RH-50 is listed in the original Makiflex catalog, so somebody was using it :smile:

Shown is Auto Iris Plaubel Makiflex #2 body with Mamiya RB Stovepipe Hacked Viewfinder, and Auto Iris Schneider 150mm F2.8 Xenotar. Seems like a good lens for low light shooting with high speed film.

Custom Made Paterson 70mm Reel hold 220 length by Nokton48, on Flickr

I just tested this new to me Paterson custom made 70mm film reel, it holds a 220 length of 70mm film. No problem loading at all, although if it starts to slightly stick during loading, I simply pull the reels gently apart, while twisting and pulling the film onto the reel. It goes on smoothly and tightly. I am really pleased. I will be making two more custom 70mm Paterson reel sets, so stay tuned on how to make your own. Two sets of reels are required to make up the necessary parts for this thing.
 
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Nokton48

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Multi Format
6x7cm 70mm Kodak 2402 Aero Film Perfed 1982 dated by Nokton48, on Flickr

This is the Makiflex Automatic with 240mm chrome barrel Schneider Tele-Xenar, a 2x3 lens that I have not used much. Graflex RH-50 70mm back 6x7cm/18 exp. Kodak Aerographic Plus-X 2402 type II perfed, developed in Paterson five reel tank with custom twin 70mm reels. D23 1:1 12 minutes at 73F produces a beefy negative easy to print. 8x10 Arista #2 RC developed in Multigrade. Omega DII laser aligned 180mm black Rodagon, I like using the Makiflexes in the studio with my olde Broncolor strobes. Classic Kelly lighting. Depth of ifeld is extremely limited in this setup, but the central buds of the flowers are sharp near the center of the print. This olde film has a softness that I like. Looks vintage and now retro
 
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rhizomeblur

rhizomeblur

Subscriber
Joined
Jan 12, 2014
Messages
89
Location
Pittsburgh
Format
Medium Format
Just got my hands on an RH50 back, and an adapter for use on the RB67 is getting printed.

My eyes are bulging imagining the size and weight of this combo! I'm sure you know this, but for anyone else reading this: Mamiya made an awesome native 70mm back for the RB67. It is way smaller and lighter, and I highly recommend it. Almost always available on Ebay.

RB67 70mm back- top back with open DS-sm.jpg


As always, info on this and all other 70mm backs can be found at www.shoot70mm.com
 

MCB18

Subscriber
Joined
Jan 16, 2023
Messages
814
Location
Colorado
Format
Medium Format
My eyes are bulging imagining the size and weight of this combo!
Surprisingly, it’s about the same weight as my motorized back (actually lighter without film). it is slightly larger in width, but hight and depth are about the same. Though, I personally don’t mind the slight size increase. I have an RB67, size isn’t exactly a big concern lol. Plus, I got it for $10 with a set of cassettes, well worth the 98% discount compared to the actual backs you can buy on eBay I think.
 
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