First results with Pentax SMC K 135mm f2.5

Started Jul 23, 2013 | Discussions thread
kitsios_spyros
Senior MemberPosts: 1,288
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Re: First results with Pentax SMC K 135mm f2.5
In reply to Kerusker, Jul 24, 2013

Kerusker wrote:

kitsios_spyros wrote:

I finally got it.

Love at first sight kind of feeling. Beautifully built and in a great condition, although later on I'll ask a question about the apperture blade movement from other owners of the lens.

At the moment I find that on K-01 it balances much better than what I thought before buying it and of course focus peaking is of great help. My first impression is that wide open is not very sharp but the bokeh, which was what I was looking for anyway, is buttery smooth. By f4 is sharpens nicely and the OOF areas are not bad either. Only issue is the 1.5m minimum focusing distance. I tried to overcome this with the use of the Raynox 150 close up filter. Playing with this combination in the garden I got some shoots with razor thin DOF when wide open both at the MFD and at infinity setting of the lens.

Then, trying to close the aperture I got this one

K135SMC f2.5 + Raynos 150 on K-01

The light was very harsh so I did not expect much, but the result is very representative of the lens's character.

Kind Regards,

Spyros

Hi Spyros,

that's an interesting photo, well done.

I don't get your question about 'aperture blades' - please explain.

Also according to http://www.bdimitrov.de/kmp/lenses/primes/tele/K135f2.5.html

there is only a 6 elem 6 groups version but two kinds: a '135' and a '135mm'.

The latter is newer and it's the one I got. What's your's?

-- hide signature --

][.Kerusker
we don't see that we don't see (eye's blind spot)

Thanks Kerusker. Mine is the SMC PENTAX 1;2.5 135mm version- SN: 5291529, but I have not found what the differences between the two versions are. I have found the following though

The K SMC lens seems to be identical to the third version of the Takumar variants

Variants:
1965: Super-Takumar 1:2.5/135 - see photo above and fist lens diagram
1971: Super-Multi-Coated TAKUMAR 1:2.5/135 (model 1) - first lens diagram

both with 5 elements in 4 groups.

1972: Super-Multi-Coated TAKUMAR 1:2.5/135 (model 2) - second lens diagram

with 6 elements in 6 groups

The latest variant has the same optical design with 6 elements as it's K counterpart. This latest variant suports open-aperture metering on Spotmatic F, ES and ESII.

Source: pentax -- forums -- lens -- database

This thread was of great help also:

http://www.dpreview.com/forums/thread/3467011

Kind Regards,

Spyros

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