From: Frank van Lindert
Subject: Re: [OM] Close Up Lenses
<< With close up lenses you won't face loss of light, as you would with
extension rings. And in macro work any extra light is most welcome! >>
At first glance this seems likely, but is it true? Does the close-up lens
increase the effective focal length of the lens (and does that matter in
itself?), and do you maybe get light loss by making the image circle bigger
so you get less light on the film, for instance?
I haven't sorted this one out. If nobody 'phones me to go to the pub this
weekend, I will be thinking about this one (maybe).
Dave Bellamy.
http://members.aol.com/synthchap/
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