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03-02-2012, 09:12 PM   #1
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Pentax 135mm f/2.5 Lens Question

I am planning on buying Pentax 135mm f/2.5 K mount lens, but I am a little bit confused about the two version of the lens. One version is Takumar (bayonet) and the other is SMC version. Are there any optical differences between these two versions? Is one better than another? Do they both work on Pentax K-5?

Thanks,
Dan

03-02-2012, 09:14 PM   #2
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The SMC version is awesome; the takumar bayonet ranges from okay to crappy. Get the SMC. (Both will work on a K5)
03-02-2012, 09:18 PM   #3
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The Takumar (budget) version will give you a lot more fringing as it's not multicoated. So I would suggest you go for the regular version instead.

Adam
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03-02-2012, 09:19 PM   #4
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Yes to all 3 questions.

Takumar 135mm F2.5 Bayonet Reviews - Non-SMC Pentax Prime Lenses - Pentax Lens Reviews & Lens Database
SMC Pentax 135mm F2.5 Reviews - K Prime Lenses - Pentax Lens Reviews & Lens Database

03-02-2012, 11:14 PM   #5
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Great. Thank you all very much. I just placed a bid on eBay for 135mm f/2.5 SMC Asahi version. I hope to win the lens.
03-03-2012, 12:19 AM   #6
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There are actually two versions of the SMC, the later 6 element version reportedly even better than the earlier 5 element one. Especially the 6 element version will likely cost you quite a bit north of 100$ these days. This is more than I'm willing to pay, since I already got two great performers at that focal length, the Super-Takumar 135/3.5 and the Jupiter-37A 135/3.5.

Last edited by Ikarus; 03-03-2012 at 12:25 AM.
03-03-2012, 05:09 AM   #7
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If they are both K mounts definitely go with the SMC version of this lens. The Takumar 135mm 2.5 was a budget lens and isn't as good as the SMC version. If it's a Takumar M42 variant you can get it as an SMC which is also good.
03-03-2012, 05:44 AM   #8
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The Tak-Bayonet version is coated but not Super Multi Coated. The Tak-Bayonet isn't as sexy as its SMC kin but it's still better than many many other 135s. I can see that my S-M-C Takumar 135/2.5 is better optically than the Tak-Bayonet. But I'm more likely to carry the Tak-B than the S-M-C. Why? Because of usability, convenience. The Tak-B has a built-in lens hood, and it focuses closer than any other of my 135s, down to 1.2m. I have fifteen 135s including some VERY good ones, but the Tak-B is the most likely to be in my carry-bag.

03-03-2012, 02:39 PM   #9
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I'm also quite happy with my copy of the K-mount Takumar 135/2.5. Stop it down even a fraction and it is a very sharp lens, with good colour rendition too.
03-03-2012, 03:09 PM   #10
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Just watch out for seller trying to make it sound like they are selling the SMC Pentax when they indeed just have the Takumar bayonet version.

The Takumar bayonets are ordinary Ernostar 4:4 lens solutions, four lenses in four groups, a solution Pentax used from 1962 to 1989 in the Super-Takumar 135/3.5 version 2, SMC Takumar 135/3.5, Takumar Bayonet 135/2.5, Takumar (Bayonet) 135/2.8, and the SMC Pentax-A 135/2.8. There was a minor change in the lens solution when they went from the f3.5 versions to the f2.5/2.8 versions that changed the close focus distance from 1.5 to 1.2m. The build quality of the Takumar bayonets are a notch or two below the other versions, especially the f2.8 version.

The SMC Pentax 135mm f2.5 is from the original K mount lens line but came a little bit later than the first K mounts. It use a more unique 6 by 6 lens solution. On my map, it is the 2nd best manual focus Pentax/Takumar 135mm lens. Only the A*135/1.8 is better, and for a much higher price. The 6:6 lens was first produced as the Super-Mulit-Coated Takumar 135/2.5 (version 2) in m42 from 1973, and from 1977 it was manufactured with K mount. The m42 version is slightly lighter.

The weight difference is not that large, the SMC 135/2.5 is 500g, while the different 4:4 versions are all slightly below 400g. They are of course shorter also. But if my priority is portability I bring the SMC Pentax-M 135/3.5 (5:5 lens solution). It is only 270g and more than a cm shorter than all the 4:4 versions.

RioRico, the built in lens hood on the Takumar bayonets, I think they are much to short for a non-SMC lens, so I usually bring an extra lens hood for it anyway. And the original lens hood for the SMC Pentax 135 f2.5 can be stored reversed, so it is easy to bring with you in the bag.

I hope you will be happy with your 135mm lens, and hope to see you joining the 135mm lens club.
03-04-2012, 09:07 PM   #11
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BINGO. I won the lens and shoul get it in few days. Is the lens that I won 6 or 5 elements version? The link to the eBay auction is
eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices
03-04-2012, 09:19 PM   #12
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QuoteOriginally posted by ddjchemist Quote
BINGO. I won the lens and shoul get it in few days. Is the lens that I won 6 or 5 elements version? The link to the eBay auction is
eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices
The price is right assuming it's in good condidtion. I had three copies of the lens and recently sold one. It's a great lens but I simply don't like the focal length on crop sensor.
03-04-2012, 10:36 PM   #13
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From the font of the smc (lower case) around the filter ring yours appears to be the 1977-1985 version, as shown on Bojidar Dimitrov's K-Mount Page. It is the full multi-coated 6 element lens. The newer b;ack/white lens cap is correct for the later version. The rear cap looks correct. The metal screw-on hood is after-market. Hoods are available from time to time on eBay and KEH.

Last edited by monochrome; 03-04-2012 at 10:43 PM.
03-08-2012, 08:37 PM   #14
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Oh yeah! That is a good one. Enjoy!
03-09-2012, 12:20 AM   #15
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