There are only two manual focus 28-200 Tamrons; model 71A (f3.8 - 5.6
Aspherical) and 171A (f3.8 - 5.6 Aspherical - Internal Focussing). The 71A
has a minimum focus of 2 meters, and you need an extra Tamron close-up lens
to get closer. The 171A focusses to 0.8 meters, which is much more useful!
The 71A was made from 1994-1998, and the 171A (still current) since 1998.
You can see the specs for all Adaptall-2 Tamron lenses (with a good deal of
Japanese, but enough numbers to be useful) at
http://www.tamron.co.jp/data/a2-lens/mflens.htm
Regards/Mvh.,
Roger Key
Larry Woods wrote:
I am interested in a Tamron 28-200mm zoom lens, but am unclear
on how many variations exist, and which are the better models. Could
someone put together a Field Guide giving distinguishing characteristics
and specifications?
Thanks.
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