Still confused on M mount compatibility w/ k1

ambenn55 · 02-21-2016, 10:42 PM

From what I've read my understanding is that the new K-1 WILL be compatible with M mount lenses but it will leave the aperture wide open? Or would I be able to adjust the aperture?

Adam · 02-21-2016, 11:39 PM

Originally posted by ambenn55

From what I've read my understanding is that the new K-1 WILL be compatible with M mount lenses but it will leave the aperture wide open? Or would I be able to adjust the aperture?

You can certainly adjust the aperture using the aperture ring. The only limitation (like on all other Pentax DSLRs) is that you have to get the camera to stop the lens down just prior to shooting to get a light reading. This allows the camera to set the correct shutter speed for the aperture you selected.

This extra step is necessary because the K-1 and other Pentax K-mount DSLRs lack the coupler that would allow the camera to sense the position of the aperture ring.

Watch this tutorial video and you'll see just how easy it is

How to Use Manual Lenses on Pentax DSLRs - Tutorial Videos | PentaxForums.com

ambenn55 · 02-22-2016, 02:03 PM

Thanks so much Adam!

stevebrot · 02-22-2016, 07:28 PM

Originally posted by ambenn55

From what I've read my understanding is that the new K-1 WILL be compatible with M mount lenses but it will leave the aperture wide open? Or would I be able to adjust the aperture?

Welcome to the Pentax Forums!

By M-mount, are you referring to Leica M bayonet? If so, the answer is no, the K-1 cannot be adapted to that mount. If you are referring to Pentax-M series lenses, you will be able to shoot with fully automatic aperture*, though only in M mode. If you are referring to M42 screw mount and want to shoot other than wide open you must switch the aperture to fully manual operation.

Steve

* Lens stops down to to the setting on the aperture ring at time of exposure and reopens when the exposure is finished.

ambenn55 · 02-22-2016, 08:41 PM

I was talking about the latter so that absolutely confirms the answer. Thank you so much Steve!

ambenn55 · 02-22-2016, 08:43 PM

I have a few Pentax M-series I love and was hoping they would work with my first venture into full frame so this is a great help!

02-21-2016, 10:42 PM	#1
ambenn55 New Member Join Date: Feb 2016 Posts: 4	Still confused on M mount compatibility w/ k1 From what I've read my understanding is that the new K-1 WILL be compatible with M mount lenses but it will leave the aperture wide open? Or would I be able to adjust the aperture?

02-21-2016, 11:39 PM	#2
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,608	Originally posted by ambenn55 From what I've read my understanding is that the new K-1 WILL be compatible with M mount lenses but it will leave the aperture wide open? Or would I be able to adjust the aperture? You can certainly adjust the aperture using the aperture ring. The only limitation (like on all other Pentax DSLRs) is that you have to get the camera to stop the lens down just prior to shooting to get a light reading. This allows the camera to set the correct shutter speed for the aperture you selected. This extra step is necessary because the K-1 and other Pentax K-mount DSLRs lack the coupler that would allow the camera to sense the position of the aperture ring. Watch this tutorial video and you'll see just how easy it is How to Use Manual Lenses on Pentax DSLRs - Tutorial Videos \| PentaxForums.com Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

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02-22-2016, 02:03 PM	#3
ambenn55 New Member Join Date: Feb 2016 Posts: 4 Original Poster	Thanks so much Adam!

02-22-2016, 07:28 PM	#4
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by ambenn55 From what I've read my understanding is that the new K-1 WILL be compatible with M mount lenses but it will leave the aperture wide open? Or would I be able to adjust the aperture? Welcome to the Pentax Forums! By M-mount, are you referring to Leica M bayonet? If so, the answer is no, the K-1 cannot be adapted to that mount. If you are referring to Pentax-M series lenses, you will be able to shoot with fully automatic aperture, though only in M mode. If you are referring to M42 screw mount and want to shoot other than wide open you must switch the aperture to fully manual operation. Steve Lens stops down to to the setting on the aperture ring at time of exposure and reopens when the exposure is finished.

02-22-2016, 08:41 PM	#5
ambenn55 New Member Join Date: Feb 2016 Posts: 4 Original Poster	I was talking about the latter so that absolutely confirms the answer. Thank you so much Steve!

02-22-2016, 08:43 PM	#6
ambenn55 New Member Join Date: Feb 2016 Posts: 4 Original Poster	I have a few Pentax M-series I love and was hoping they would work with my first venture into full frame so this is a great help!