[Leica] 24 x 36mm ?

[hoppyman at bigpond.net.au (G Hopkinson)]

Robert, just my SWAG about the optical laws. I'm setting up a better 
controlled experiment with a 28, 50 and 135 at small and large
apertures on the same body.
Since I don't want to be scratching my head alone, what about the effect of 
different apertures, with the same lens? Surely the exit
angles must then differ markedly? 
Very interesting that you see the lens angle effect with the enlarger mask. 
I noticed the camera to camera variation with a fixed
crop in scanning.
I am feeling that there is a huge gap in my trigonometry and optical 
knowledge here.
For your part of the experiment can you accurately measure your easel and 
neg carrier?

Cheers
Hoppy

-----Original Message-----
From: lug-bounces+hoppyman=bigpond.net.au@leica-users.org [mailto:lug- 
Subject: Re: [Leica] 24 x 36mm ?

Far be it from me to tamper with the laws of optics!   (Other laws, perhaps, 
but not the laws of optics!)

I'm just speaking empirically, from my own experience.  I use a Beseler 
negative carrier that has a 25x37mm opening to show the whole negative plus 
some, and negatives that I have shot with my 21mm Skopar almost fill the 
25x37mm area, while shots made with my 50mm Summicron leave a lot of clear 
negative showing.   When I had the 12mm VC lens, it filled even more of the 
carrier opening.

Robert
----- Original Message ----- 
From: "G Hopkinson" <hoppyman@bigpond.net.au>

> 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 ;-)
> -----Original Message-----
> Subject: Re: [Leica] 24 x 36mm ?
>
> If you shoot with a wide-angle lens, the negative image will be slightly
> larger, and the wider the lens, the larger the image gets.   The reason 
> for
> this is that the greater angle of the light striking the film with a
> wide-angle spreads the light, and thus the image, slightly under the edges
> of the film gate.
>
> ----- Original Message ----- 
>
>>>From neg samples here, widths of:
>> 111c Width 36.84 mm     distinctly much tighter spacing
>> M3 36.78mm      gaps visibly not quite as narrow as 111c
>> M6 & M7 35.6mm
>>
>> Cheers
>> Hoppy
>> -----Original Message-----
>> Lew said:<lew1716@optonline.net>
>>> I'm just off to my darkroom to confirm something that's been bothering
>>> me for a while. The standard 35mm full frame format is supposed to be
>>> 24 x 36mm or 1:1.5. This should mean that I can print full frame at
>>> 6x9", but (this is the part that's bugging me...) the images from my
>>> Leica negatives never quite fit an opening of this size on my easel.
>>> The only thing I can think of to explain this is that the Leica negs
>>> just aren't exactly 24x36mm.
>>> OCD acknowledged, other comments ...?<<<<<<<