Close focus correct is important for shooting close distance objects, normal
lenses are design optimized at infinity. The resolution and other aberration
control is poorer at close distance. Wide angle Zuiko 18, 21/2, 24/2 and
28/2 all have close focus correction system. They have floating rear element
group design. When the focusing distance change, the rear group will also
slightly move to compensate for the optical errors.
I found the Zuiko 50/1.4 (F4) at close distance is much poor than the 21/2
(F4) at same magnification (around 1:15)
Concerning the front problem mentioned by John, I personally seen two with
heavy scratched coating, should care about that.
C.H.Ling
----- Original Message -----
From: "Machiel" <machiel.botman@xxxxxxxxxxxxxx>
I am (also) looking into the Zuiko 28mm f2.0 and have some questions.
- this lens has a close-distance correction mechanism - what does that
mean?
- I read this did not exist in the earliest version - is there a way of
telling which version is which (lens nrs?)
- Anyone has experience with this and can tell something about the
practical difference between yes/no close distance correction
mechanism?
Thanks, Machiel
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