Originally posted by John Poitiers à m42man: Thanks for your link ... didn't see that specific one, but did stumble upon Falk Lumo's chart(s). I am really excited to have found my 75-150 f4, and it's great to hear that it's "good" like you and this forum's users have stated ... I kind of based my purchase decision in part on their reviews. Do you have suggestions for another manual zoom ... or maybe a short fix (I'm looking first for a M or A 50mm f1.7 or faster, then maybe a 28mm).
Pleased to be of help!
I can't offer much by way of recommendation regarding zooms (the M75-150 is the only manual zoom I have), but I can say there are plenty of nice 50s, 35s and 28s out there (especially if you're willing to consider M42 lenses):
You've mentioned the Pentax 50/1.4 and 50/1.7. You could also consider the S-M-C Takumar 55/2 and Rikenon 50/2 (very sharp, very cheap, probably best to avoid the -P version).
For 35s, look at the S-M-C Takumar and rarer Pentax "K"s. Highly recommended!
For 28s, go for the Vivitar Close Focus (Komine f2 and f2.8 versions, identified by serial numbers starting with "28"). Again, highly recommended (though I unfortunately don't own one that is mountable on my camera - yet!).
Happy hunting!