Re: Lenses for 645D?

[Jostein]

----- Original Message ----- 
From: "Bob Shell" <[EMAIL PROTECTED]>

Krrrrrrrrraaaaaakk!  Watch out!  The ice is breaking and the water 
is  cold!!

LOL

I would suspect that other factors may influence the apparent 
sharpness as well, such as chromatic aberrations. I imagine that a 
645 lens would have to be better CA corrected than a corresponding 
35mm lens.

You have that backwards.  More CA is tolerable in a MF lens, because 
the final image is enlarged less.

You're probably right that the lesser magnification is the most 
important here too.
When I wrote the above, I was thinking that the longer register 
distance would accentuate CA...

Speaking of which... How are the optics of 645 and K-mount related 
with regards to optical construction?
If you have, say, a 300mm for 645; which would be its closest sibling 
in K-mount, constructionwise? I'd like to think that it's simply 
following the focal length to the number, but I suspect that AOV 
enough significance to make it more akin to a 200mm in 35mm.

Jostein