[Leica] 24 x 36mm ?

[henningw at archiphoto.com (Henning Wulff)]

At 11:16 AM +0100 6/8/07, Frank Dernie wrote:
>I could be wrong here but doesn't the image appear to be projected 
>onto the film from the rear lens vertex? or is that exit pupil? If 
>so a retrofocus wide angle lens will not project as big an image 
>through the film gate as a symmetrical lens of the same focal 
>length. The gate is only a couple of mm ahead of the film so it 
>won't be that much apart from designs like the hologon.
>Frank
>
>On 8 Jun, 2007, at 08:59, G Hopkinson wrote:
>
>>  Robert, I follow what you are saying. I'll have to think about 
>>that, I have a suspicion that you may be tampering with some laws of
>>  optics there ;-)
>>
>>  Coming at it my post below from another direction, always 8 
>>sprocket holes per frame, consistently much smaller gap between 
>>frames
>>  over complete films shot with varying lenses, with the older cameras.
>>
>>  Today's useless trivia item for film photographers.
>>  Now I'll shut up before someone beats me up with a bag full of 
>>broken digicams.
>>
>>  Cheers
>>  Hoppy
>>

That's right, Frank. It's the rear exit pupil that is the 
determinant, and why the Hologon makes the biggest negs. The current 
21 ASPH makes a smaller image than the Super Angulon; it's easy to 
see on the negatives.

-- 
    *            Henning J. Wulff
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