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02-11-2015, 06:18 PM   #1
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Easiest way to mount M42 lenses on K-3?

Hello all,

One of my friends in a local photography group has a vast collection of M42 lenses. He was kind enough to tell me that I can borrow his lenses anytime. The issue is that I did not find an easy way to juggle between M42 lenses and my own K-mount lenses. Internet research told me that the adapter has to be attached on to camera first in order to mount M42 lens. So I have to perform a small surgery on my K-3 every time I want to juggle between M42 and K-mount lenses. I also read numerous horror stories of adapter getting stuck to the camera.

So, I am here to ask all you experts to see if there exists an easier (and safer) way to use M42 lenses on my K-3? Is there an adapter that I can attach to M42 lens to make it a K-mount lens?

Any input is highly appreciated.

Thank you.

02-11-2015, 06:29 PM - 1 Like   #2
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With the original adapter you will have no problem. It takes 5 seconds to "perform the surgery"
02-11-2015, 07:43 PM   #3
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^^^^^ What he said. The original Pentax adapter works flawlessly. All of the issues you read about are from cheaper ebay ones. Some of these work, some do not. Just spend the extra and get the Pentax one.

You can buy adapters for each lens if you want. But you should remove the metal spring lock, this is what causes the issues. I have one on my 400mm because it is too hard to screw the 400mm onto the camera. But for all other lenses I use the Pentax adapter. And if you remove the spring clip then the only thing holding the lens onto the camera is the k-mount bayonet. Usually that is fine, but I don't trust it.
02-11-2015, 07:44 PM   #4
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this original Pentax adaptor will work very well, I have a large number of M42 old lenses and never had a problem

02-11-2015, 08:00 PM   #5
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I go out with M42 or I go out with manual K-mount or I go out with AF. So I happily mount the adapter on the camera and live with that for a while; removes the need to remove the adapter frequently.
02-11-2015, 09:20 PM   #6
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I have the original and a knock off - how do you remove the original without a tool? I have not found either one to be hard to remove using the Kalt tool.
02-11-2015, 09:24 PM   #7
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QuoteOriginally posted by UncleVanya Quote
how do you remove the original without a tool? I have not found either one to be hard to remove using the Kalt tool.
I just use my thumbnail. Never thought about it, it just comes right off.
02-11-2015, 09:29 PM   #8
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QuoteOriginally posted by jatrax Quote
I just use my thumbnail. Never thought about it, it just comes right off.
LOL I have been overthinking it.

02-11-2015, 09:41 PM   #9
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QuoteOriginally posted by UncleVanya Quote
LOL I have been overthinking it.
I did not know there even was a tool until I bought a couple ebay ones to mount semi-permanently on my longer lenses. But I just took the spring clip off those and tossed the tool in the parts box.
02-12-2015, 02:59 AM   #10
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just get the original adapter and you're good to go. the original one goes on and comes off in literally 2 seconds.
the m42 world is a fascinating one some truly amazing lenses out there
02-12-2015, 03:10 AM   #11
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QuoteOriginally posted by UncleVanya Quote
I have the original and a knock off - how do you remove the original without a tool? I have not found either one to be hard to remove using the Kalt tool.
The user manual that comes with the original says to use a ball-point pen.


Image source: Pentax Mount Adapter K (M42 Screwmount to Bayonet) Reviews - Pentax K-mount Teleconverters and Adapters - Pentax Lens Reviews & Lens Database
02-12-2015, 03:16 AM   #12
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QuoteOriginally posted by sterretje Quote
The user manual that comes with the original says to use a ball-point pen.
that user manual is a bit silly though. i doubt anyone carries a ball point pen with them just for this purpose.what if you're out and want to switch from an m42 to a k-mount? thumbnail does the job for me
02-12-2015, 04:32 AM   #13
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QuoteOriginally posted by schnitzer79 Quote
what if you're out and want to switch from an m42 to a k-mount?
I don't switch in the field I either carry K-mount (usually either manual or AF) or M42. So no need to switch in the field
02-12-2015, 06:44 AM   #14
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QuoteOriginally posted by sterretje Quote
Mine came in the original box but without instructions.
02-12-2015, 08:08 AM   #15
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Box? Never seen that one so don't know. Mine came in a small green plastic sleeve as seen in the photos by i-trax; I bought it in January 2010.
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