I posted this in the K club thread but reckoned I´d get more responses in a separate thread. Thanks to "gofour3" for his contribution there, I´ve pasted it below in case anyone else wants to comment.
So, I can get a good condition bayonet mount 55mm F1.8 at a reasonable price, but am debating if it will bring me anything over the M 50/1.7 that I currently have. It´s appealing due to the slight extra length that brings it to 82.5mm on APS-C.
The 55 is slightly longer but apparently reasonably sharp enough wide open, and deadly sharp stopped down a couple, which is good, but does it suffer from colour fringing? My M 50 suffers a bit from this. Is the K sharper than the M?
The K55 seems to have some nasty, funky bokeh at times too, which I´m concerned about. I´ve found plenty of pics taken with it online, but because it´s manual it´s often impossible to know the aperture value used.
Extra weight or size does not bother me, though the 52mm filter thread will be a pain as my four M lenses are all 49mm. If it´s better built (there are lenses better bult than Ms???
) then that´s definitely a worthwhile compromise.
Opinions? What would this lens bring me?
Many thanks for any help offered.
From "gofour3":
I don’t shoot digital, but on film the K55/1.8 is a perfect lens that does not suffer from fringing or any other issues. It’s also a bargain price wise compared to other Pentax lenses in this FL range. The K55/1.8 is also better built than the M50/1.7, but it's also heavier.