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01-19-2013, 09:02 AM   #1
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How to use Pentacon 135mm f2.8 for K-5

Like the title, i just bought a Pentacon lens, what must i do to use it on my K-5?

P/S: Please excuse my stupidness

01-19-2013, 10:08 AM   #2
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Is it an m42 mount or the bayonet mount? If it's the latter, return it and get your money back. If the former, you will need to get an m42 to PK adapter for the lens, enable MF lens on the K-5 and shoot in Av mode (stopped down metering).
01-19-2013, 10:11 AM   #3
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Now this is new to me. I've never heard of bayonet mount . How do i know what mount it is?
01-19-2013, 10:27 AM - 1 Like   #4
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Your K-5 is a KAF2 bayonet mount, M42 is screw mount. If the Pentacon lens has the mount that look remotely similar to any Pentax lens, return it.

01-19-2013, 10:33 AM   #5
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1st of all, thank you for being such patient to me.

Could you take a look at this link: Bn PENTACON 135mm f/2.8 multicoating | XM CH? | XOM NHIEP ANH - XM NHI?P ?NH

That's my lens. Is it usable?
01-19-2013, 10:56 AM - 2 Likes   #6
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That would be M42 screw mount, which will work on the K-5 with an adapter.
01-19-2013, 10:57 AM - 1 Like   #7
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The lens pictured has the M42 (also called Praktica/Pentax/Universal screw) mount and is adaptable to your K5. My only concern with the lens is that it looks like the Manual/Auto slider at the lens base appears to be missing or damaged.

As noted above, you will need an M42 adapter. There are detailed instructions other places on this site on how to used an M42 lens on a Pentax dSLR. The short version is that you must shoot and meter with the lens stopped down. With an M42 lens this must be done manually by you. I would suggest using M mode rather than Av mode with your camera. M mode will give more accurate metering as recommended in the K5 manual.

Instructions here:

https://www.pentaxforums.com/forums/pentax-lens-articles/110657-how-use-meter...ml#post1140019


Steve
01-19-2013, 11:02 AM   #8
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OMFG, this is the best moment in my day.
I checked the slider, it's still there and works. Not smoothly, but works.
And M42 is not so hard to be found here .
Thank Steve, Excanon and ellitot <3. Have a nice weekend

01-19-2013, 11:38 AM   #9
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Why is the k mount version bad?
01-19-2013, 12:27 PM   #10
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QuoteOriginally posted by klkitchens Quote
Why is the k mount version bad?
There is no K mount version, the Praktica B mount looks similar to a K mount at a glance, but is not compatible with a Pentax body.
01-19-2013, 12:30 PM   #11
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QuoteOriginally posted by elliott Quote
There is no K mount version, the Praktica B mount looks similar to a K mount at a glance, but is not compatible with a Pentax body.
Gotcha... thanks!
01-20-2013, 08:43 PM - 1 Like   #12
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QuoteOriginally posted by infactimacat Quote
OMFG, this is the best moment in my day.
I checked the slider, it's still there and works. Not smoothly, but works.
And M42 is not so hard to be found here .
Thank Steve, Excanon and ellitot <3. Have a nice weekend
If you are going to use a third party manufactured M42 to K adapter, I would suggest that you unscrew the small screw holding the leaf spring on the adapter and leave them off. Tighten the adapter on to your newly acquired lens with a K mount lens cap and use the lens like a K mount lens. Those third party adapters are notorious for getting stuck in the camera (with the screw and spring intact) and may even require a delicate surgery to remove it from the camera.
01-25-2013, 05:55 PM   #13
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QuoteQuote:
There is no K mount version, the Praktica B mount looks similar to a K mount at a glance, but is not compatible with a Pentax body.
I think there was also a (rare) Exa/Exakta mount version, which looks very much like the K mount. This could have been adapted. There should be a detailed description by RioRico somewhere in this forum.
01-28-2013, 10:52 AM   #14
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QuoteOriginally posted by excanonfd Quote
If you are going to use a third party manufactured M42 to K adapter, I would suggest that you unscrew the small screw holding the leaf spring on the adapter and leave them off. Tighten the adapter on to your newly acquired lens with a K mount lens cap and use the lens like a K mount lens. Those third party adapters are notorious for getting stuck in the camera (with the screw and spring intact) and may even require a delicate surgery to remove it from the camera.
I got the mount adapter. Good enough to use. Trying to find away to remove the leaf spring as you said.

This lens works like a charm to me, but i'm still learning how to do the best with it, eg: how far should i be away from the object,..

All the best, guys
01-28-2013, 05:30 PM   #15
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There should be a tiny screw holding the spring, undo the screw and leave both off the adapter.
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