<<Extension tubes do degrade the image -- by causing the lens to operate at
a focal distance it may not have been optimized for. Many lenses, for
instance,
develop substantial field curvature when extended. A converter optimized for
a lens may give superior performance.
Paul Farrar>>
Thanks for the techie answers.
I do still like my idea of carrying a 25mm tube to use on all my OM lenses.
If I did more closeup or macro I would certainly consider a macro lens.
I assume that the curvature development would also pertain to bellows with
the same lenses.
Does this have a lot to do with the degraded images of a tele converter,
non matched lens combo? Not for close up but for long shots.
Another thought, The 25mm tube loses 1 stop. The 2x converter loses 2
stops.
Are there lenses that are optimized for extension tubes?
Charlie L
Expanding his information overload!
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