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05-21-2012, 12:58 PM   #1
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What about the SMC Pentax M 135mm F2.5 Lens?

I recently bought a K1000 SE with SMC Pentax M 50mm F2 and SMC Pentax M 135mm F2.5 lenses. I wasn't really looking for the 135mm so that was a bonus. The 135mm lens I see online only goes to f/3.5 so I triple checked to make sure that yes, my lens goes all the way to f/2.5. Unfortunately I can't find any information about my 135mm F2.5 lens. It would expect it to be identical to the SMC Pentax M 135mm F3.5 lens except for the maximum aperture, but my lens has a built in retractable lens hood and I'm not sure the 135mm F3.5 does.



Does anybody else have this lens? How much is it worth? How well regarded is it? Does it truly have the same design and optical characteristics as the 135mm F3.5?

Any info will be appreciated.

05-21-2012, 01:10 PM   #2
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Are you sure it says SMC Pentax-M 135/2.5? Because I don't see any such in the database (search here). Does it maybe just say SMC Pentax 135/2.5? That would make it a highly-regarded K-series lens (review here).
05-21-2012, 01:18 PM   #3
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You sure it says SMC? The non-smc Takumar 135mm f2.5 has built in hood. Apparently worth about $50. I gather it is not bad. I only used/have the K SMC 135 f 2.5 which is superb.
05-21-2012, 01:28 PM   #4
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Both my (non-SMC) Takumar Bayonet 135/2.5 and SMC-M 135/3.5 have sliding hoods. Both my (non-PK) S-M-C 135 f/2.5 and f/3.5 don't, and neither does the SMC (K) 135/2.5. As for value: I can't say what my four are *worth*, but I *can* say that I paid about US$50 each. The K goes for about 3-4 times that I think.

BTW although my S-M-C 135/2.5 is optically my most brilliant 135, and my SMC-M 135/3.5 is my smallest (and very nice!), the Takumar Bayonet 135/2.5 is my most-used 135. Why? Speed and hood help. But mostly it's because it has the shortest close-focus-distance of all my 135s. Most only go to 1.5m; the TakB goes to 1.2m; and sometimes (enough times) that makes a real difference. Sure, I could put another on a very short tube section, but then it loses convenience. The TakB is just my most convenient 135.


Last edited by RioRico; 05-21-2012 at 01:35 PM.
05-21-2012, 01:30 PM   #5
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Can you post a pic of your lens?

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05-21-2012, 04:12 PM   #6
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To clarify, there are many different 135mm lenses, but only one in the "M" series - the M135/3.5. If your is f/2.5 and definitely made by Pentax as opposed to some other companies, then it is either the K135/2.5 (which would not have the letter "K" anywhere on it, but would be called SMC Pentax 135mm 1:2.5" or something like that) or the Takumar 135/2.5. The former is considered great, the latter fairly mediocre.
05-21-2012, 04:12 PM   #7
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I have seen the k version but not the M version for SMC 135/2.5 a couple of times on fleabay a couple of times in the last few months. I don't think that the SMC M 135/2.5 was ever made by Pentax.
05-21-2012, 05:27 PM   #8
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The 1980 catalog lists the
SMC PENTAX 135mm f/2.5
SMC PENTAX-M 135mm f/3.5

05-22-2012, 06:58 AM   #9
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Okay, I looked at my lens again. It doesn't say "Pentax", "M" or "SMC" anywhwere on it. I don't know why I was so convinced ... I assumed it came in a kit with the SMC Pentax M 50mm and then assumed it was therefore also "SMC Pentax M". Mine is definitely the Takumar 135mm F2.5.
05-22-2012, 10:28 PM   #10
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QuoteOriginally posted by stainsor Quote
Okay, I looked at my lens again. It doesn't say "Pentax", "M" or "SMC" anywhwere on it. I don't know why I was so convinced ... I assumed it came in a kit with the SMC Pentax M 50mm and then assumed it was therefore also "SMC Pentax M". Mine is definitely the Takumar 135mm F2.5.
Ah, does it say TAKUMAR (BAYONET)?
05-23-2012, 01:28 PM   #11
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yeah, it sure does.
05-23-2012, 02:06 PM   #12
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QuoteOriginally posted by stainsor Quote
yeah, it sure does.
Your lens is made by Pentax. It was issued as a budget-minded 135/2.5 K-mount lens lacking the best coatings available at the time. Some users say the lens is very sharp; others say without the SMC coatings the lens is less contrasty than the SMCP 135/2.5 (the "K": version) and less resistant to flare.

Here's a link to the Forum data and review page for your lens.
05-23-2012, 04:59 PM   #13
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I repost the test I did recently; it was an excessively harsh test but it shows the difference between the uncoated Bayonet and an SMC, with adverse sunlight direction.
Both lenses had hoods in use.

The Takumar (Bayonet) 1:2.5 135mm is quite a good lens actually, if not pointed into the glare

Takumar (Bayonet) 1:2.5 135mm
https://www.box.com/s/4e91ed5c1331f5a05ec9

SMC Pentax-M 1:2.8 100mm
https://www.box.com/s/8f5ebb334d5b81e41e4c
05-24-2012, 01:21 AM   #14
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That's a nice test, wombat2go!

I think you've probably also illustrated the difference between the Tak (Bayonet) 135/2.5 and the M135/3.5 (which is, I'm sure, very similar to the M100/2.8).
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