Rapid Rectilinear 150mm f/8 with stuck aperture

[loccdor]

What if you had a Rapid Rectilinear 150mm f/8 covering 4x5+ with stuck aperture, and you only ever wanted to use it at f/22?

Is it easy to get into this type of lens to place a plastic cutout aperture? It's from a Kodak Autographic. Would it be terrible to make an "f/22 lens cap"?

Thanks

 

[koraks]

Have you tried the obvious route of...fixing it?

 

[Jim Jones]

What if you had a Rapid Rectilinear 150mm f/8 covering 4x5+ with stuck aperture, and you only ever wanted to use it at f/22?

Is it easy to get into this type of lens to place a plastic cutout aperture? It's from a Kodak Autographic. Would it be terrible to make an "f/22 lens cap"?

Thanks

The aperture in this lens should be centered between the lens cells. I don't know exactly what using a lens cap aperture would do do the image, but it can't be good. You might experiment to check this.

 

[loccdor]

Have you tried the obvious route of...fixing it?

I will if it's relatively easy to do. I'm not a camera or lens mechanic by any stretch.

 

[loccdor]

The aperture in this lens should be centered between the lens cells. I don't know exactly what using a lens cap aperture would do do the image, but it can't be good. You might experiment to check this.

Thanks, possibly some vignetting, I've heard, though I don't have an idea about how much. I'll try the interior route if I can figure it out.

 

[film4Me]

The aperture blades could be stuck together. I would pour lighter fluid on the blades after removing the front and rear glass. Then pour more lighter fluid between the casing and the rotating aperture handle ring. Gently apply pressure to the handle and test for movement. If it still doesn't move, you may have to loosen screws and try again. It will eventually come unstuck, unless there is a hard foreign object caught somewhere in the workings of the aperture. This could be a dislodged pin from one of the blades, or perhaps a very tiny particle of gravel that made it's way in. The front and rear glasses are screwed in and they may need a rubber stopper pressed against them to act as a friction device to save your fingers getting abraded.

 

[jimgalli]

Go to your Napa Auto Parts store and get some of this liquid rubber buffer. I don't know what it is but it is solvent and it frees up things like stuck apertures. Squirt it on the outside by the aperture ring and try moving it. Usually they get stuck in the very fine threads on the outside. It leaves no residue, but sometimes it will loosen up old lube and gook that does leave a residue, so have some cotton swabs handy. You'll want to unscrew the front lens group and the rear lens group first and set them aside. Good time to clean both sides of the glasses with 91% alcohol. Don't be afraid of this stuff. You'll feel like you accomplished something when it's all spiffy and working perfect again.

https://www.napaonline.com/en/p/BK_7651322

 

[bdial]

According to the MSDS, it’s heptane.

 

[John Wiegerink]

Yes, I'd try the fluid-flush as suggested and if that doesn't work it might mean one of the blades pins have slipped out of its slot and jammed the aperture. Most of these old shutters have the aperture directly behind the shutter blades in the rear of the shutter. That means the guts of the shutter have to be removed to get at it. Not a lot of fun. If the flush doesn't work you have a choice of sending the shutter out for repair or try your hand at fixing it. If it were mine I would try to fix it myself, but I'm pretty lucky sometimes. If I ended up trashing the shutter and loved the lens I would then hunt down a parts shutter/lens combo and put my good cells in the good shutter. I think it would be cheaper doing that than sending the shutter out for repair. That's just me.

 

[loccdor]

Yes, I'd try the fluid-flush as suggested and if that doesn't work it might mean one of the blades pins have slipped out of its slot and jammed the aperture. Most of these old shutters have the aperture directly behind the shutter blades in the rear of the shutter. That means the guts of the shutter have to be removed to get at it. Not a lot of fun. If the flush doesn't work you have a choice of sending the shutter out for repair or try your hand at fixing it. If it were mine I would try to fix it myself, but I'm pretty lucky sometimes. If I ended up trashing the shutter and loved the lens I would then hunt down a parts shutter/lens combo and put my good cells in the good shutter. I think it would be cheaper doing that than sending the shutter out for repair. That's just me.

Thanks John. I'll give it a shot. I managed to fix an Olympus Pen D yesterday (with some difficulty), so maybe I am not as much of a screwdriver-fumbler as I thought I was...

 

[Erik L]

Here’s a possible shutter donor that they are basically giving away if your repair attempts go awry?

VINTAGE Kodak No. 3A Model C Folding Camera with Leather Case | eBay

Includes Leather Case.

www.ebay.com

 

[loccdor]

Here’s a possible shutter donor that they are basically giving away if your repair attempts go awry?

Thanks Erik, good option, hopefully one camera will do the trick though.

 

[Erik L]

Thanks Erik, good option, hopefully one camera will do the trick though.

For sure, it was just a thought as you can’t get a shutter serviced for $19.99!