P3D Re: enlarger lens

[koganlee@xxxxxxxxxxxxx]

On 10/20/98 10:44:54 you wrote:
>
>I have recently aquired a new enlarger lens, which is 1000 sharper
>than the old one, but it is 50mm and the old one was 80mm.  Since all
>my printing records are in 80mm I need a formula to figure out how to
>adjust the exposure when I use the 50mm lens.  Does anybody know how
>to do this?
>
>Jeremy
>_________________________________________________________
>DO YOU YAHOO!?
>Get your free @yahoo.com address at http://mail.yahoo.com
>
>
>

Jeremy,

The first thing that comes to mind is whether you are using 35mm negatives 
or 120 (which commonly utilize 80mm enlarging lenses). If you are using 120 
then the 50mm lens will not cover the edges.

If you're using 35mm then the lens should be fine and I believe the exposure 
will be pretty similar. I'm sure that out of the thousands of enlargements 
I've made I have done some with both of these lenses and I seem to recall 
the operative factor being the size of the negative, not the size of the 
lens, all other things being equal. In any event, if you make a good print 
from a negative you have printed before, then you will be able to obtain a 
factor between the 2 prints that should hold for other negatives.

David Lee


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End of PHOTO-3D Digest 3032
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