Wanted: SMC Pentax 135mm


sam-joseph

Link Posted 01/12/2009 - 21:01
Wanted: SMC Pentax 135mm f2.8 A.
I know this one gets some bad press, but others say it's great.
I just want a fairly good Pentax lens to fill a hole in my camera bag.
I'll also consider an f2.5(although it's fully manual and I really do prefer those little electrical contacts)or maybe an f3.5. Any views on my selection are most welcome.
Sam-Joseph
Pentax K7, Sigma 17-70 f2.8-4.5, Sigma 70-200 f2.8 APO EX, Sigma 70-300 APO, Sigma 1.4x TC, Vivitar 2x TC. Takumar 135mm f2.5, SMC Pentax A 50mm 1:1.7, SMC Pentax -M 1:4 200mm, Pentax X70

iceblinker

Link Posted 01/12/2009 - 22:37
The Pentax A 135mm is rare and costly. The M f3.5 version is commonly found on eBay though.

Please see my advert on this forum for a Sears 135mm f2.8 with electrical contacts! It's optically not as good as the very best Pentax 135mm (SMC K f2.5), but it's not too far behind.

I can ship it to Oz for just a few pounds more.
~Pete

sam-joseph

Link Posted 02/12/2009 - 10:29
I've changed my mind, now. Turns out the f2.8 is mechanically not up to speed with the older lenses(4 elements in 4 groups as opposed to 6 elements in 6 groups for the f2.5. Even the f3.5 has 5 elements in 5 groups. As for the f1.8, 7 elements in 6 groups blows everything else away.) Not that the element count is the defining factor in a lenses worth, but I figure more glass can only be a good thing. So now I'm shifting my focus(no pun intended) to the f2.5, and in particular, the one with the exact designation: smc PENTAX 1:2.5 135mm"" This model was made from 1977 - 1985, I believe. Anybody have one available??
By the way, iceblinker, I'm sure the Sears is very good, and it has the A connection, but it's time I bought a real true blue PENTAX.
Regards
Sam-Joseph
Pentax K7, Sigma 17-70 f2.8-4.5, Sigma 70-200 f2.8 APO EX, Sigma 70-300 APO, Sigma 1.4x TC, Vivitar 2x TC. Takumar 135mm f2.5, SMC Pentax A 50mm 1:1.7, SMC Pentax -M 1:4 200mm, Pentax X70

iceblinker

Link Posted 02/12/2009 - 11:31
sam-joseph wrote:
I figure more glass can only be a good thing.

I said something like that on the forum once before - and was told I was wrong! Simpler can mean better. Although I don't think it applies in this particular case as the 4-element 135's are commonly not thought to be as good as the 6-element ones....

Quote:
So now I'm shifting my focus(no pun intended) to the f2.5, and in particular, the one with the exact designation: smc PENTAX 1:2.5 135mm"" This model was made from 1977 - 1985, I believe.

That's the one I have - very good indeed, apart from some green/purple CA.

There is also the version just before that (1975-77) with "SMC" in capital letters. It's otherwise the same, as far as I know. See www.bdimitrov.de/kmp/lenses/primes/tele/K135f2.5.html
~Pete
Last Edited by iceblinker on 02/12/2009 - 11:44
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