15± years ago confusion about the 135mm lens lineup was the reason I went 
looking for information. And found what later became the PDML. And found a 
range of opinions and advice. I gathered and synopsized all of the opinions 
about all of the 135mm offerings and that was the beginning of my (now dormant) 
online repository of opinion on Pentax lenses. 

WRT 135mm, the consensus was that the best was the A 135/1.8, next was the K 
135/2.5, but a close competitor to both of these was the M 135/3.5. 

stan

On Aug 16, 2014, at 8:59 PM, Zos Xavius <[email protected]> wrote:

> This explains all the mixed reports I've heard about the K 135 2.5. A
> big part of me wants to fill my bag with nothing but K series glass.
> My back might not like that though...
> 
> On Sat, Aug 16, 2014 at 11:29 AM, Bob Sullivan <[email protected]> wrote:
>> Yes, the weak Takumar 135/2.5 in K mount has a multicolored dof scale
>> on the barrel - always easy to spot on ebay.  I also believe it is not
>> multicoated glass.  The older SMC K 135/2.5 is an excellent lens,
>> second only to the A135/1.8.  Most people don't know about it.
>> Regards,  Bob S.
>> 
>> On Fri, Aug 15, 2014 at 11:31 PM, Darren Addy <[email protected]> wrote:
>>> Bob,
>>> Sorry, I should have explained that part a bit better for those who
>>> are unaware of the confusing state of Pentax's 135mm f2.5 offerings.
>>> 
>>> Here are the versions of the 135mm f2.5 made by Pentax:
>>> Screwmount:
>>> 1) Super Takumar and S-M-C Takumar Version 1
>>> 2) S-M-C Takumar Version 2 (6 element design)
>>> 
>>> K-mount
>>> 3) SMC K 135mm f2.5 (6 element design)
>>> 4) Non-SMC & confusingly named "Takumar Bayonet" version which you can
>>> find almost anywhere for $50/60.
>>> 
>>> So I was making the point that the one I am offering (3) is the same
>>> optical design as (2) but not to be confused with the vastly inferior
>>> (4).
>>> 
>>> Hope that clears things up.
>>> 
>>> On Fri, Aug 15, 2014 at 11:12 PM, Bob Sullivan <[email protected]> 
>>> wrote:
>>>> A bit confusing offer.
>>>> There is a SMC K 135/2.5 lens in a K bayonet mount, but you say NOT 
>>>> BAYONET.
>>>> So are you offering a screwmount version?  Why not say so directly?
>>>> Regards,  Bob S.
>>>> 
>>>> On Fri, Aug 15, 2014 at 6:40 PM, Darren Addy <[email protected]> wrote:
>>>>> As you probably know, this is the K-mount version of the acclaimed
>>>>> Super-Multi-Coated Takumar 135mm f2.5 (version 2), the 6-element
>>>>> design. This is the finest optical design Pentax made in the 135mm
>>>>> focal length. On a DSLR it gives you the equivalent of a 200mm FOV and
>>>>> f2.5.
>>>>> 
>>>>> This one is gorgeous cosmetically, optically, and mechanically and
>>>>> comes with the original clip on hood, front & rear caps, and matching
>>>>> "SMC Pentax" hard case. If you are picky about the used lenses you
>>>>> purchase, this one is for you.
>>>>> 
>>>>> $199 plus actual shipping cost to your address. Email me off-list for a 
>>>>> quote.
>>>>> I prefer not to use Paypal, but would be happy to issue you a Square
>>>>> Invoice if you desire to pay by credit/debit card.
>>>>> 
>>>>> Respectfully,
>>>>> Darren Addy
>>>>> Kearney, NE
>>>>> 
>>>>> --
>>>>> Photographers must learn not to be ashamed to have their photographs
>>>>> look like photographs.
>>>>> ~ Alfred Stieglitz
>>>>> 
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>>> look like photographs.
>>> ~ Alfred Stieglitz
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