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09-26-2007, 07:35 AM   #1
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M42 f2.5 135 vs f3.5 135


I have been offered a Super Multi Coated f2.5 135mm Lens that is in Pretty good shape.

Now I already Own an f3,5 version of the lens and am Pretty happy with it, Fact it is a damn GOOD lens,..even wide open!

Just wondering what peoples thoughts are on the matter, if anyone has owned both!

faster IS Nicer,..but Not unless it Performs Optically better!

I had heard WIDE open, the f3.5 was better, so perhaps the differences are small, Unless ofcourse the 2.5 has unique optics.


09-26-2007, 07:45 AM   #2
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Interested to hear the responses also, as I'm considering these two lenses.
09-26-2007, 08:17 AM   #3
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The Super-Multi-Coated Takumar 135/2.5 is one of my favorite lenses at all. It is good in every way, with great out of focus rendering and low CA. I sometimes hear criticisms that it isn't sharp, but this is compared to other 135s that IMO don't handle the out-of-focus areas well. My copy is as sharp as I want, I am guessing it is still out-resolving the sensor in the K10.

The 135/3.5 lenses are also good, but I give a slight edge in every aspect except size/weight to the f/2.5.
10-08-2007, 01:13 AM   #4
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I don't know whether the M42-Super-Tak is optically the same as the K-version.
In 1980 the german ColorFoto made a test of all 135mm lenses including these 2 Pentax-lenses.
The 3.5 has a very constant quality throughout the whole picture range.
The 2.5 is sharper in the center but has a little fall-off to the corners.
I suspect that the region where the 2.5 is weaker than the 3.5 are not visible on dslr.
- yes, I have both lenses (in K-mount)-
they are different in their characteristics!

The K 2.5 is even better built!

But resolution-wise it is not a superb lens that is better than new zoom-lenses! But colour and vignetting and distortion are by far better... of course!

Oh yes - I will continue using both lenses for different things.
The K 2.5 a little bit too heavy for walking around - that's where the 3.5 is my lens.
The 2.5 is used for indoor sports and (sometimes) portraits.
- oh yes: The 2.5 is VERY usable wide opened!

On film-slr I compared it with the A* 1.8/135 and the Tokina AT-X 2.8/80-200:

At 2.5 the K was close to the A* at 2.8 (better than the A* at 1.8) and far better than the Tokina at 2.8!

:-) Paul

10-12-2007, 06:00 AM   #5
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Original Poster
Thanks for that,..I decided against it, as to be Honest, I Really am Looking for an 85 or 105, Especially, as My f3.5 Super Multi Coated, is Really an absolutely Lovely example! I AM Extremely Happy with My lens and always have been,'s often just Nice to have that Extra bit of Speed. lol

I'd have to go and get a Whole Bunch of Larger Filters Then as Well !!,

10-12-2007, 09:05 AM   #6
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If you can find a Vivitar Series 1 105mm f/2.5 lens. The quality is superp and it is a true 1:1 macro as well. They are P/KA mount lens and other than the lack of auto focus one of the best lens ever made.

10-13-2007, 02:26 AM   #7
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Photozone have a test of the SMC 135mm f2.5 here PhotoZone It rates well. I have one and really like it on both film and digital bodies.


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