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Old 8th April 2015, 06:42 AM
cesare cesare is offline
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Join Date: Aug 2009
Location: Brighton
Posts: 350
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Quote:
Originally Posted by Alan Clark View Post
Before I got a decent 75mm enlarging lens I always used a 150mm lens to print 6x6 negatives. This was in a Meopta Magnifax with a 6x9 condenser. This worked very well with very even coverage. The head was further uo the column for a given print size than it would have been with a 75mm lens. But for some reason this doesn't result in an increased exposure time. Never could figure out why....

Alan
For a given f-stop, any focal length producing the same size enlargement will have exactly the same exposure.

I prefer a longer lens myself, and use a rodagon 120 for medium format. With larger working distances you need to have a more stable enlarger for decent prints, but that's about the only downside!
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