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[OM] New 90mm Zuiko macro

Subject: [OM] New 90mm Zuiko macro
From: Mike Gordon via olympus <olympus@xxxxxxxxxxxxxxxxx>
Date: Thu, 9 Feb 2023 00:18:13 +0000 (UTC)
Cc: usher99@xxxxxxx
Overall a very nice addition and has sync IS.  A modest positive surprise is 
that it works with both TC's 1.4X and 2X. Not that is needs any more mag but as 
expected the 
working distance is a bit tight.  Close focusing distance in S macro mode (odd 
ball switch which moves lens elements and lose max aperture goes to F5 or F5.6, 
(reviews were discordant)) is 8.8 " with working distance 2.5."  (2:1 
magnification).  Working distance at 1:1 only 3.7".  Effective focal length at 
1:1 about 112mm not 180 mm ---- but that isn't totally fair even if technically 
correct as really should use focus distance at 1:2 to calculate.  I could not 
find that.  Anyway, some of that is related to the MFT format and some to focal 
length shortening.  It really is only a 180 mm FF equivalent fov at infinity.   
For skittish critters a high-quality long FL zoom with achromatic CU diopter 
may still be a tad better than the new lnes by itself.  A 1.4 TC with the new 
lens might be a very good choice, however.  Testing should be done.  


Macro Mike

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