EOS to Pentax Lens mount adaptor

Ryalux · 03-13-2018, 11:35 AM

Hi
I have a Pentax K-r and am looking for a lens mount adaptor so I can use a Sigma DG 150-500mm 1:5-6.3 APO HSM lens which fits a Canon EOS M EF-M
Can anyone suggest where I can obtain one of these or if they are even made.

Adam · 03-13-2018, 11:44 AM

Originally posted by Ryalux

Hi
I have a Pentax K-r and am looking for a lens mount adaptor so I can use a Sigma DG 150-500mm 1:5-6.3 APO HSM lens which fits a Canon EOS M EF-M
Can anyone suggest where I can obtain one of these or if they are even made.

You can go the other way, but I don't think the EOS-M lens would work on a K-mount camera because of the short registration distance.

Ryalux · 03-13-2018, 11:58 AM

Originally posted by Adam

You can go the other way, but I don't think the EOS-M lens would work on a K-mount camera because of the short registration distance.

Thanks Adam.
Just been told it is actually an Lens mount‎: ‎Canon EF/EF-S not sure if that makes a difference.

Adam · 03-13-2018, 12:03 PM - **1 Like**

Originally posted by Ryalux

Thanks Adam.
Just been told it is actually an Lens mount‎: ‎Canon EF/EF-S not sure if that makes a difference.

Nope, it still can't be adapted unfortunately. However, that same lens is also available in the Pentax mount if you can get one.

Adam
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**boriscleto** · 03-13-2018, 12:48 PM - **1 Like**

An adapter, if one existed, would be a short teleconverter because of the focal flange distance. The aperture on EF mount is electronic, so you would be limited to whatever one aperture. There would be no autofocus either.

As Adam said, there is a K-mount version of the lil'Bigma. Two actually, one with OS and one without.

03-13-2018, 11:35 AM	#1
Ryalux New Member Join Date: Jan 2012 Photos: Albums Posts: 8	EOS to Pentax Lens mount adaptor Hi I have a Pentax K-r and am looking for a lens mount adaptor so I can use a Sigma DG 150-500mm 1:5-6.3 APO HSM lens which fits a Canon EOS M EF-M Can anyone suggest where I can obtain one of these or if they are even made.

03-13-2018, 11:44 AM	#2
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,608	Originally posted by Ryalux Hi I have a Pentax K-r and am looking for a lens mount adaptor so I can use a Sigma DG 150-500mm 1:5-6.3 APO HSM lens which fits a Canon EOS M EF-M Can anyone suggest where I can obtain one of these or if they are even made. You can go the other way, but I don't think the EOS-M lens would work on a K-mount camera because of the short registration distance. 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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03-13-2018, 11:58 AM	#3
Ryalux New Member Join Date: Jan 2012 Photos: Albums Posts: 8 Original Poster	Originally posted by Adam You can go the other way, but I don't think the EOS-M lens would work on a K-mount camera because of the short registration distance. Thanks Adam. Just been told it is actually an Lens mount‎: ‎Canon EF/EF-S not sure if that makes a difference.

03-13-2018, 12:03 PM - 1 Like	#4
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,608	Originally posted by Ryalux Thanks Adam. Just been told it is actually an Lens mount‎: ‎Canon EF/EF-S not sure if that makes a difference. Nope, it still can't be adapted unfortunately. However, that same lens is also available in the Pentax mount if you can get one. 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:

03-13-2018, 12:48 PM - 1 Like	#5
boriscleto Loyal Site Supporter Join Date: Dec 2009 Location: North Syracuse, NY Photos: Gallery Posts: 16,476	An adapter, if one existed, would be a short teleconverter because of the focal flange distance. The aperture on EF mount is electronic, so you would be limited to whatever one aperture. There would be no autofocus either. As Adam said, there is a K-mount version of the lil'Bigma. Two actually, one with OS and one without.