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Re[2]: [OM] Vivitar Series 1 Macro 105/2.5

Subject: Re[2]: [OM] Vivitar Series 1 Macro 105/2.5
From: JIM_TEO@xxxxxxxxxxxxx
Date: Fri, 29 Jan 1999 8:51:51 +0800
     
Greg,

Thank you for the info., maybe I need to look out for the 100/3.5 instead.


Jim


Jim,
     
Herbert Keppler devoted his July 1996 SLR column in Pop Photo to a comparison 
of the Vivitar Series 1 105/2.5 Macro and the much less expensive Vivitar 
100/3.5 Macro. He reported that the 100/3.5 actually outperformed the 105/2.5 
at 1:1 and 1:2, center and corner. The 100/3.5 goes to 1:2 unaided and uses a 
special matched achromatic close-up lens to reach 1:1. The close-up lens 
reduces effective focal length to 75 mm at 1:1, but working distance is only 8 
mm less than with the 105/2.5 due to the longer helical extension of the 
105/2.5 (140 mm vs. 132 mm working distance).
     
Physical stats: the 105/2.5 is 100 mm long, weighs 650 g, and uses 52 mm 
filters; the 100/3.5 is 65.5 mm long, weighs 270 g, and uses 49 mm filters, 
the OM standard. Seems like the 100/3.5 fits the Olympus "smaller and lighter" 
philosophy!
     
I have never handled either of these lenses, but the article caught my 
attention and made it into my tear-sheet file.
     
Hope this helps.
Greg
     
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