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[OM] FS: Vivitar S1 90/2.5 Macro

Subject: [OM] FS: Vivitar S1 90/2.5 Macro
From: usher99@xxxxxxx
Date: Thu, 01 Feb 2007 18:55:50 -0500
Hmmm,  I am  very surprised you would sell this one. 
 
 I have one from Paul which is very nice.  I believe he mentioned the coatings 
were slightly different as well as the color rendition.    I don't remember the 
details.  I've posted the "Invasion of the Monarchs"  once before though below 
is my favorite with this lens.  I'm not selling mine and would think about a 
spare.  Jeff first raised my interest in this one. (Thanks)
 
http://gordon9213.zoto.com/galleries/macro11/detail/11/
 
I did find a couple shots side-lit sans hood  covering about 20 ft in front of 
the lens that  revealed a substantial loss of contrast.  I bet the hood would 
help or fix that.  I  now have a 58mm hood (Hama knock-off).  I tried the Moose 
vignetting test with the hood  fully extended----i.e. light source projected 
through rear of camera onto a sheet and checking for vignetting at various 
settings.  I could not detect any problem  wide open at any macro distance.  
The most stringent test for physical vignetting of the hood is at infinity.  
The image was a bit too dim to judge, though I could not detect any problem a 
bit closer.  I have a scanned image  of the loss of contrast w/o a hood if 
someone wants it.   
Oh, the  Z. 135/4.5 macro does indeed go to infinity too with the auto tube.  
Marnie took a couple nice ones with it at that distance.  I'm not selling that 
either.
 
Mike
 
 
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