Ayse{at}ada.com.tr said to Photo at 09-30-04  11:41
 Subject: tamron, initial results

 Ay> hi,

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

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

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

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

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

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

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

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

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

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

 Paintshop Pro has great correction routines to handle the ")(" and the
 "()" problem in a few clicks.




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