Don Laing , Nov 15, 2009; 03:16 a.m.
I have the 28mm 2.8 F lens, which I think was the first autofocus 28 by Pentax. Its main virtues are that it is light and compact. The 28mm focal length is suitable for around town/street photography and the compact size does not draw undue attention. Image-wise, it is an average performer, but lacking the digital coatings, it is sometimes prone to flare and lack of contrast. I don't have the 3.5 to compare it with. Under the right lighting conditions you should be able to make an A3+ size print using this lens.