Re: Image diameter ....?

Art Reitsch <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>...
> I can't find a reference on this, so am I thinking straight?  A 4x5 
> film, taking the longer dimension, is 5inches = 127mm.  So if  a lens 
> has an image diameter of 127mm or more it will cover 4x5, right?  And 
> the larger it is, the more movements permitted?  So on, say, a 75mm lens 
> what would be a reasonable minimum image diameter for some modest 
> movements for landscapes?
> Thanks.
> Art

Calculate diagonal using Pythagorean theorem:  sqrt(4^2 + 5^2) = 6.4"
= 163mm.  Less due to clipping in film holders.