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08-12-2018, 01:26 PM   #1
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Curious about the performance of K-5II with Sony Sonnar T 135mm f1.8 ZA?

I haven't seen anyone talk about this lens which is a heavyweight in the category and I believe it has its own league. Can anyone chime in how you think this duo performs?

08-12-2018, 01:34 PM   #2
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what adapter are you using for this lens/body combination?
08-12-2018, 01:58 PM   #3
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Is it even possible to adapt this lens to Pentax without a glass adapter? That would affect the performance.
08-12-2018, 02:01 PM   #4
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The Sony has a shorter registration distance even in A mount so it would require optical glass and likely act as a teleconverter.

08-12-2018, 02:16 PM   #5
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Fotodiox makes a Sony A mount to Pentax PK mount adapter, and the adapter indeed has corrective optics, which could degrade the lens performance.
08-12-2018, 02:26 PM - 2 Likes   #6
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QuoteOriginally posted by Mohican Quote
I haven't seen anyone talk about this lens which is a heavyweight in the category and I believe it has its own league. Can anyone chime in how you think this duo performs?
QuoteOriginally posted by jlstrawman Quote
Fotodiox makes a Sony A mount to Pentax PK mount adapter, and the adapter indeed has corrective optics, which could degrade the lens performance.
Yes, for the very reason stated above, I wouldn't bother adapting it. You'll end up with a manual focus, optically-inferior tool (because of the adapter's optical element) with difficult-to-control aperture, if indeed the adapter offers any aperture control at all...

You'd be far, far better off considering something like the Samyang 135mm f/2. It's a high-performing manual-focusing lens, and will hold it's own with most fast 135mm models. By the time you've added the optically-corrected adapter to the Sony Sonnar, I've absolutely no doubt that the Samyang will leave it for dead (optically and operationally)

EDIT: Full disclosure, to add helpful info... In addition to Pentax I actually shoot Sony A-mount, and have a number of excellent lenses - but I don't bother trying to adapt them to K-mount for the reason given...

Last edited by BigMackCam; 08-12-2018 at 04:04 PM.
08-12-2018, 03:42 PM - 1 Like   #7
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unfortunately, this montage A sony can not be adapted to pentax,
there is a competitor of weight for this lens with excellent results
samyang 135mm f2 and superb
6 Days Ago   #8
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For the last word on manual focus 135mm lenses in K mount, try this one:

SMC Pentax-A* 135mm F1.8 Reviews - A Prime Lenses - Pentax Lens Reviews & Lens Database

It has a special unobtanium lens coating, Quite a few on fleabay at the moment. Not cheap, but neither is a Sony plus adapter,

PS: For something cheaper, check out this one:

https://www.pentaxforums.com/userreviews/spiratone-135mm-f1-8-ys.html

On the whole, the Samyang is the best bet. Available new and unmolested.


Last edited by Wasp; 6 Days Ago at 02:29 AM.
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