I just bought a tammy 28-75 used off of ebay. the seller is great and would take the lens back if I am not happy. I am not a test chart shooter (not now anyways) but I am noticing some weird backfocus issues on the lens (so far tried on the D1H only, I will try on D200 and D200 later). This is no sceintific test anyway but just some quick snaps on a new lens...(please do not look at my wonderful composition and subject choice :wink The lens seems to backfocus only at 75mm open wide unless I focus on a flat subject). Or is it a deapth of field control? This may as well be me but your input is really appreciated. All 100% crop, no in camera sharpening, an USM of 50-5-4 is applied in NX (to null the effect of the AA filter), no tipod used. Exif is in the oimages. f2.8 http://i109.photobucket.com/albums/n43/smodak/DSC_0120.jpg http://i109.photobucket.com/albums/n43/smodak/DSC_0104.jpg http://i109.photobucket.com/albums/n43/smodak/DSC_0092.jpg f4 http://i109.photobucket.com/albums/n43/smodak/DSC_0105.jpg http://i109.photobucket.com/albums/n43/smodak/DSC_0099.jpg Am I imagining things?