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02-16-2012, 02:04 PM   #1
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K-5 body with old Mx lenses?

I have been wanting to get a dslr for quite some time now, and am thinking about the K-5. I have a Pentax MX (from 1976) with several lenses and understand it's possible to use these old lenses with the dslr bodies (without af). Does this apply to the smaller bayonet mount of the MX, or is this possible only with the K-series mount size?

02-16-2012, 02:41 PM   #2
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A K-mount is a K-mount. The MX did not have a different mount. The only issues you might run into involve third-party lenses. (Aperture Flange & "Ricoh" pin)
02-16-2012, 02:43 PM   #3
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MX uses the same K-mount as all the rest of them -- the camera is smallish, mount is the same.
02-16-2012, 03:16 PM   #4
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Welcome aboard!

As others have said - it's a K-mount so the lenses are interchangeable with the modern dSLR. I have a trio given to me from my sister and BiL of M28/50/135 that work a treat on my K-x and K-5. Those are among the lenses that were sold on the MX, so you'll be in manual focus and aperture with them but they'll do fine on the modern camera.

02-16-2012, 03:32 PM   #5
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Cool! I plan on using my old Pentax 1.4 50mm mostly for flower & landscapes & getting a new 300mm lens for wildlife & birds (when I can afford it). I am a photo retoucher by trade, and can't wait to go digital! Haven't done any serious photography in years, my point & shoot is ok, but stifling when I try to work on its images in Photoshop.
02-16-2012, 04:27 PM   #6
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Welcome to the Pentax Forum. As noted above, your lenses will work fine with your K-5. Those with "A" contacts will support all meter modes. Those without can be also be used in M mode. Use the green button for stop-down metering.


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02-16-2012, 04:40 PM   #7
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Check out the 'lens club' threads for images which show these old K, M and A lenses in action, and to see how popular they still are.
02-16-2012, 04:52 PM   #8
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Here's the guide to using M lenses. Just remember to set the camera to M mode and allow use of the aperture ring via the custom function menu

\https://www.pentaxforums.com/forums/pentax-lens-articles/110657-how-use-meter...k-x-k-7-a.html


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02-16-2012, 05:38 PM   #9
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QuoteOriginally posted by ElKay23 Quote
Cool! I plan on using my old Pentax 1.4 50mm mostly for flower & landscapes & getting a new 300mm lens for wildlife & birds (when I can afford it). I am a photo retoucher by trade, and can't wait to go digital! Haven't done any serious photography in years, my point & shoot is ok, but stifling when I try to work on its images in Photoshop.
Very nice lens to start with on a K-5. Have you looked at the DAL 50-300's? They're relatively inexpensive and get good marks for IQ, etc. While certainly not a 300 Prime they also aren't nearly as dear.
02-16-2012, 06:04 PM   #10
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I will point out, as someone who also went to the K-5 to use my MX lenses, that trying to focus them on the K-5 is dismal compared to the MX. The finder seems much smaller and harder to see exact focus. Many suggest a different focusing screen works better - I still have to try that. The K-5 will indicate when it thinks it is in focus, but it isn't very precise.
However, after all that I must say I've gotten some nice results with the K-5 and older lenses. It's just not the joy to use that the MX was.
02-16-2012, 06:54 PM   #11
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QuoteOriginally posted by TomB_tx Quote
I will point out, as someone who also went to the K-5 to use my MX lenses, that trying to focus them on the K-5 is dismal compared to the MX. The finder seems much smaller and harder to see exact focus. Many suggest a different focusing screen works better - I still have to try that. The K-5 will indicate when it thinks it is in focus, but it isn't very precise.
However, after all that I must say I've gotten some nice results with the K-5 and older lenses. It's just not the joy to use that the MX was.
If I find myself having to do really fine focus and the target isn't running around or moving, the LCD works well for focusing as well. Its kind of awkward, but it works.
02-16-2012, 07:33 PM   #12
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QuoteOriginally posted by Sagitta Quote
If I find myself having to do really fine focus and the target isn't running around or moving, the LCD works well for focusing as well. Its kind of awkward, but it works.
That may well be true, and a good method. But folks my age used to a real viewfinder for 50 years hate using LCD screens.
02-16-2012, 07:54 PM   #13
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And you know what I'll miss is the depth of field preview. Appreciate all the input.
02-16-2012, 08:47 PM   #14
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QuoteOriginally posted by Docrwm Quote
Very nice lens to start with on a K-5. Have you looked at the DAL 50-300's? They're relatively inexpensive and get good marks for IQ, etc. While certainly not a 300 Prime they also aren't nearly as dear.
Looked one up, yes that's a good price, worth looking into. My old lens is an 80-210 is a Komuranon.
02-17-2012, 11:36 AM   #15
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My heart's racing: I have a K-5 Body kit & DA 55-300 from Adorama in my shopping cart. Income tax refund on the way. Should I pull the trigger?

Last edited by ElKay23; 02-17-2012 at 04:16 PM. Reason: changed from DAL to DA
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