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I saw this lens on ebay; "new old stock" 35-90mm Tamron for Pentax.
The seller listed the lens as a 35-70 but that wasn't correct according to the picture, which shows marking of 35-90.
It was going for $15 up until the last few minutes and the winning bidder got it for $29.
I had a hard time finding any information on this lens. It might be an Adaptall but I'm not sure.
Out of curiosity, is anyone familiar with this lens?
Tamron AF 35-70mm F:4.0/5.6 zoom for Pentax AF/ Digital - eBay (item 360329698789 end time Dec-26-10 06:59:38 PST)