Hi ... I have one of these lenses, which I recently commented on for another list member who was considering it.
I agree that it's a bit soft at wider apertures, and that there is light falloff that, for some people with some subjects, could be unacceptable. While it's true that the image shapes up and starts to look good at 4.0 or 5.6, I've never noticed the aberrations you've described at the wider apertures. IOW, it's not a great lens, but I don't think it's as bad as you describe it to be. And once it's in the 5.6 - 11.0 range, the results are very nice. Good detail right out to the corners, decent (but not superb) resolution, also out to the corners. No signs of smearing. One of my nicest, recent photos was made using it at f8.0 with TX. Although the print is only 8 x 80, the results look quite satisfactory, and I think an 11x14 should be no problem. Frantisek Vlcek wrote: > > Hi, > I tried out a lens I thought about buying, it's the Pentax A 28/2, > it was in very good condition. The results from the roll of 100 iso > film: AWFUL! The lens was worse than any other I have seen, almost > worse than a Tamron 28/2.5 ... > > 1) at wide open to about f/4, the lens exhibited AWFUL coma around > all objects, except in center. This gradually lessened but didn't > disappear until f/4 or f/4.5. This exhibited mostly at infinity, > but was also obvious at close focus, rendering IMHO all images > taken until f/4.5 UNUSABLE AT ALL. > > 2) the center was VERY sharp, especially at smaller apertures > > 3) the extreme corners were never very sharp, even at f/8, they > exhibited a lot of smearing. > > 4) I didn't check for astigmatism, don't know. > > My question - is this normal for this lens? It had quite good marks > at Yoshi's page. And this model was in very good condition, no > marks, etc. -- Shel Belinkoff mailto:[EMAIL PROTECTED] http://home.earthlink.net/~belinkoff/ You can't have everything. Where would you put it? - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
