Tariq Gibran wrote:
One thing I will mention is that I have both the Minolta MC W. Rokkor SI 28 2.5 and the Pentax K 28/3.5. While the Rokkor has a nice look to it\'s rendering, the Pentax is technically better at every aperture - even wide open at 3.5 vs the Rokkor stopped down to 3.5/4. The Rokkor is also larger.
interesting, all the way to the corners? is your rokkor bleached? I haven\'t shot with the pentax (my bias against lenses slower than f/2.8) but the full sized samples I saw seemed unimpressive in the corners. (bad copy?).
Particularly in the corners. I will post some comparisons when I get a chance.
By \"Bleached\" do you mean have I UV\'d the yellow away? No, I haven\'t.
The thing about the Pentax K 28/3.5 is that it makes all the difference if it\'s the much worse M version or the original K version as they are completely different lenses optically. If you saw bad results with the correct version, it must either be the lens sample (doubtful I suspect) or poor technique.
There are actually four different Pentax 28 f/3.5 models. Two in M42 mount and two in K mount. The oldest model was a SuperTak with 58mm filter threads it had 7 elements in 6 groups. There was a later model in M42 mount that had 49mm filter threads and had 7 elements in 7 groups, some of these were SMC and some weren\'t. Then the plain K mount version with 8 elements in 7 groups with a 52mm filter threads, and finally the M series K mount version with 6 elements in 6 groups and 49mm filter threads. It is the plain K mount version that has the good reputation. The other three designs generally are not well regarded. The drawbacks of the plain K mount, IMO, are that it only has 5 aperture blades, which could show ugly pentagons in out of focus highlights at times, and it is pretty big for a 28 f/3.5. With a volume of 232200 cubic mm with adapter on the Sony cameras it is a bit bigger than the Sony/Zeiss 55 f/1.8, so not really a small lens which is a bit of a bummer for such a slow aperture lens, although it isn\'t huge in the grand scheme of things either.
Aug 18, 2014 at 12:53 PM
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