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Date: Thu, 30 Sep 2004 21:34:54 +0300
From: ayse saray 
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Subject: tamron, initial results
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hi,

this is the lens i have recently got to try and compared it to
vivitar 28-105, 1/3.5-4.5 mounting on my nikon fg-20:

"TAMRON SP 28-80MM 1;3.5-4.2 CF MACRO LENSE"

to make it equal and easier, i preferred automatic timing and f/8 and
iso of 100. (tried 200 also but was confused so used 100 then.)

i shot macro objects in front of both dark and white backplans, leafs
and flowers at different positions with respect to the sun light, and
both with 28 and 80, at home with room enlightment, streets,
reflections, places with shady and sunny parts... 

if the sun is not generous, tamron showed much lesser timing than
vivitar and finished shooting much more earlier. (good! as i generally
shake the vivitar while waiting...)

however, the results were astonishing. generally, while those of
vivitar were as shiny as a sea shore tamron's were much more close to
the real lightening, and darker and more contrast and... significantly
grainy at shades or dark objects. :((

other than this, it seems to reflect lesser light (from the windows
etc) and have less artifact due to this. i guess this is, in deed,
parallel to its timing values.

tamron also seems to have little lesser distortion particularly at
horizontal axis. at the vertical axis, tamron seems to pull as ")("
while vivitar prefers to push as "()".

today i started shooting some pairs (as i wrote above) with tamron
only. first with automatic timing, then timing to the values it needs.
i hope to finish it tomorrow and see the last results.

waiting for your comments and suggestions while eating my nails. 8L


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