It depends a bit what you measure as the aspect ratios of full frame 35mm differ from 6x7 MF. A lot of people take the diagonal and then 45mm equals more or less to 90mm, but to match the negative sizes of full frame 35 mm and MF you will have to step up to 6x9.
Or perhaps I am missing something?
Yes, aspect ratio. That's what @Huub pointed out; I think he understood your question perfectly. The problem is that the answer depends on what you compare on both formats: image diagonal or some other metric? Note that the aspect ratio (6x7 for 6x7cm, 2:3 for 35mm) has impact on the image diagonal, which in turn is often used as a starting point for focal length comparisons.
the second conversion step
the answers on Photrio are never as simple as one may have hoped
If you meant that a conversion from 35mm to 'full frame digital' would have been necessary, then obviously not, because full frame digital (as used by most people) is the same as 35mm...
The caveat is that full frame digital in a medium format context would mean something different, of course...
people said that 35mm film is equivalent of 50mm full frame
That's an odd formulation. I suspect they said something like "a 50mm lens on a 35mm camera is the equivalent of a 90mm lens on a 6x7cm camera." In that case they're talking about focal length equivalents for different sensor/film sizes.
...since almost everyone has a smartphone with calculator, you really only need the calculation to be done when figuring out what FL initally to buy, and once you bought the 'equivalent FL' you simply pick up that lens without need for any calculation!
Am I correct that that implies, with a 90mm lens that I do the following equation?To go from 6x7 to 35mm: multiply 6x7 focal length by 3/7
Wow, never realised there was something like this, whihc exactly why I wanted to know my equivalent focal lengths!If I'm somewhere without a camera I'll just fire up the Viewfinder app on my phone and take screenshots.
Yup. Simple as that.Am I correct that that implies, with a 90mm lens that I do the following equation?
(90 x 3) / 7 = 38.6mm
Wow, never realised there was something like this, whihc exactly why I wanted to know my equivalent focal lengths!
Which one do you use, and do you know if it would cater for my Mamiya 6X7
I compare the horizontal angles of view because the vertical and diagonal are meaningless for normal viewing.( except if you're doing a portraiture).
Who visualizes a diagonal point of view? We normally want to know the width that we want to capture.
Ahem.....smiles, clears throat, etc, etc
etc
Choosing the right lens for a different camera to photograph a block print according to the same perspective, well, that might be important to someone. It would be to me if the copy stand were involved. Or it might be important to someone photographing a cramped interior space. Or maybe they just want reasonably matched lenses due to familiarity of visualization related to angle of view, or just for the hell of it. It's a legitimate question.
Drat - I was hoping for a simple ratio / formula so I could establish the equivalent focal length once and for all. I have discovered a long time ago that the answers on Photrio are never as simple as one may have hoped
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