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Re: [OM] lens comparasons

Subject: Re: [OM] lens comparasons
From: ALEXSCIFI@xxxxxxx
Date: Tue, 1 Feb 2000 22:04:23 EST
In a message dated 2000-02-01 6:01:36 PM Eastern Standard Time, 
image66@xxxxxxx writes:

<< Back to lenses, just because two lenses might spec out nearly identically,
 the character and individuality comes out.  For example, just because a
 zoom lens might reach 35mm/2.8 and have identical
 resolution/distortion/contrast tests as a prime doesn't mean the photos
 will be identical.  The optics used to achieve those results are completely
 different and will have different bokeh and sense of presence.  In my book,
 no zoom ever achieves the look of a good prime.  To me, the zooms look
 "organic" in comparison, even though the specs may be as good, if not
 better.  Take the 100/2.8 for example and compare its images at F5.6 to any
 zoom at the 100/5.6 setting.
 
 Ken Norton
  >>
I'm not so sure about that Ken. I recall seeing Zeiss MTF curves on one of 
their early zooms (a 40-80 or so) that seemed to imply that while a zoom 
might get close to a prime over much of it's range, there could be a point 
(or even points) in it's range where it could "surpass" a near equivalent 
fixed lens--because all that glass is in it's "sweet" spot. Another example 
is the 35-80F2.8 Olympus lens--there's no doubt that it has substantial 
barrel distortion at 35 mm and substantial pincushion distortion at 80 mm. 
But that implies there is a point between 35 and 80 where there is NO 
distortion!  Would anyone know what that point might be? Because it may also 
be especially sharp (as in very high contrast and resolution/MTFs) there.

Having said all that, I have to confess only in the last year have I 
purchased and used zooms to any extent. My one prior experience with the OM 
75-150SC was a severe disappointment. Initial impression of the 65-200 are 
very favorable--but more testing to do.

Alex

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