I did have an A 28/2.8 for a while, which is the same formula as the F lens, and it never significantly impressed me. Some of that may have been that the PZ-1 I used with it seemed to overexpose a bit with that lens. In any case, it never seemed terribly sharp. I do like the FA 28 I have, which gives a really nice color rendition, sharpness, and bokeh similar to the other FA primes I have (35/2, 50/1.4). I haven't noticed the supposed light fall off in the corners of the FA lens, but I'll try to pay attention to that when I test them out.
The F lens is interesting, because it was essentially the only wide angle autofocus prime lens Pentax had for a few years during the F series.
Joe
I'm confused about the difference in image quality between the F28/2.8 and the FA28/2.8. I understand that the FA has a new optical formula that uses an aspherical element. But some sources seem to indicate that the F is better than the FA, while others seem to indicate that the FA is an improvement over the F.
Can those of you who have used both shed any light on this for me? What are the relative advantages and disadvantages of the F28/2.8 and the FA28/2.8?
I would be using it mainly as a normal lens on my *ist D, so I'm only interested in the middle ~43% of the images they make on film negatives.
I understand the FA has some light falloff in the corners at wide aperatures, but I don't care about that.
Thanks,
Greg
