Hi, I have one question about this lens, the first version (ATX 2.6-2.8/28-70, not the later 2.8/28-70 or the last more plasticky 2.8/28-70 ATX SV). I have borrowed it for a while from a friend, and after shooting some with it, it seems this sample is very best corrected for close focus, like portrait distances of 1 or 2 meters. There it is exceptional even wide open, I was quite surprised. Farther away the performance drops, with some coma and some softness. It's not bad even there, but just needs more stops down. I was curious about this happening, and wanted to ask if others who used this lens (mind you, just the first version, 2.6-2.8, rumoured to be designed by Angieneux), have similar experience or not?
Yes, my experience is similar to yours, Frantisek. It is a fine performer. I have the ATX Pro II 270 AF, 28-70 2.6-2.8 and I am satisfied with it. The only thing is that it flares more than SMC Pentax lenses, and that barrel distortion at 28 mm. is noticeable in architechture shots, but it is a zoom and this is to be expected.
Carlos
