Re: 12x18 w/35mm lens

>
>
> Hi All
>
> I am building a large "mammoth" Camera, 12x18, And I have A lens for a
> argus c3 that I was going to use as my lens. but I know that the f-stop
> relates as the distance from the hole to the film Plate. So if the lens
says
> F5.6 for 35 mm that would but much smaller for my
> 12x18 format and I need this equation so I can use the C3 lens and write
> the new F-stops on it. IF anyone has any help please let me know.

Hi John,

the Argus lens was made for a certain lens-film-distance, and at this
distance the lens will not make a full-size image on 12x18 (inch, I assume).

If you take a larger distance, you can only shoot close-ups (the larger
distance is like using bellows with a 35 mm camera).

You will have to look for a lens designed for large formats and appropriate
distance ...

cheers

martin adler

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