Pentax DA* 16-50 on Canon full-frame

pomabille · 01-10-2016, 02:01 PM

Hi everyone!

I hope to be posting under the right section. I have found a similar topic in this forum but still have some questions.

I've been looking into getting an adapter to mount my DA* 16-50 f/2.8 on my Canon 6D body. I'm intending to get the Fotodiox adapter with focus confirmation function and need clarification on a couple points:

-I understand the small aperture lever at the back of the lens will have to be removed (more or less barbarically) as it would otherwise get in the way of the mirror. I know I will be losing AF control and will only get focus confirmation. However, will I still retain aperture control in Av and M modes on a lens with no aperture ring?

-Since I am mounting an APS-C lens on a FF body, I am expecting to get darkened corners at wider apertures, but I mostly shoot landscapes at f/8 or smaller so I'm not expecting this to be a problem. Is there anything else to consider as far as shooting in a crop lens on a FF sensor?

Thanks in advance for any help you guys can provide

bertwert · 01-10-2016, 02:03 PM - **5 Likes**

One question:
WHY?

**UncleVanya** · 01-10-2016, 02:33 PM

That lens won't adequately cover that sensor from what I recall. It will cover the 1.6x cropped section plus perhaps a bit more.

disconnekt · 01-10-2016, 02:46 PM

You'll get alot of vignetting. You might as well just get & use a K-mount manual lens & correct adapter.

Adam · 01-10-2016, 02:48 PM

The lens will always be stopped down to F22 without the aperture lever, so you can't really use it. Not to mention the fact that it simply doesn't cover the FF image circle.

https://www.pentaxforums.com/forums/54-pentax-lens-articles/31629-da-lenses-f...ts-thread.html

If you'd like to adapt a Pentax lens onto your canon, look at the F/FA/FA* series or any manual lens.

pomabille · 01-10-2016, 03:01 PM - **1 Like**

Thanks a lot for your replies everyone! I suspected it wouldn't be that easy but I thought I'd check anyway.

Oldbayrunner · 01-10-2016, 04:49 PM

That's too good a lens to bastardize. Why not sell it and buy a lens that works with your Canon.

UMC · 01-11-2016, 12:13 AM

... and here is the outcome if you mount this lens on a fullframe or analogue body:
First image @16mm focal length,
Second image @ 50mm focal length.

This would be my last lens to use on fullframe...

01-10-2016, 02:01 PM	#1
pomabille New Member Join Date: Apr 2014 Location: Calgary, AB Posts: 15	*Pentax DA 16-50 on Canon full-frame** Hi everyone! I hope to be posting under the right section. I have found a similar topic in this forum but still have some questions. I've been looking into getting an adapter to mount my DA* 16-50 f/2.8 on my Canon 6D body. I'm intending to get the Fotodiox adapter with focus confirmation function and need clarification on a couple points: -I understand the small aperture lever at the back of the lens will have to be removed (more or less barbarically) as it would otherwise get in the way of the mirror. I know I will be losing AF control and will only get focus confirmation. However, will I still retain aperture control in Av and M modes on a lens with no aperture ring? -Since I am mounting an APS-C lens on a FF body, I am expecting to get darkened corners at wider apertures, but I mostly shoot landscapes at f/8 or smaller so I'm not expecting this to be a problem. Is there anything else to consider as far as shooting in a crop lens on a FF sensor? Thanks in advance for any help you guys can provide

01-10-2016, 02:48 PM	#5
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,608	The lens will always be stopped down to F22 without the aperture lever, so you can't really use it. Not to mention the fact that it simply doesn't cover the FF image circle. https://www.pentaxforums.com/forums/54-pentax-lens-articles/31629-da-lenses-f...ts-thread.html If you'd like to adapt a Pentax lens onto your canon, look at the F/FA/FA* series or any manual lens. 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:

01-11-2016, 12:13 AM	#8
UMC Senior Member Join Date: Dec 2012 Location: Vienna Photos: Gallery Posts: 205	... and here is the outcome if you mount this lens on a fullframe or analogue body: First image @16mm focal length, Second image @ 50mm focal length. This would be my last lens to use on fullframe... Attached Images

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01-10-2016, 02:03 PM - 5 Likes	#2
bertwert Veteran Member Join Date: Jun 2015 Location: Golden, BC Posts: 15,172	One question: WHY?

01-10-2016, 02:33 PM	#3
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,454	That lens won't adequately cover that sensor from what I recall. It will cover the 1.6x cropped section plus perhaps a bit more.

01-10-2016, 02:46 PM	#4
disconnekt Pentaxian Join Date: Oct 2011 Location: SoCal/I.E. Photos: Albums Posts: 1,702	You'll get alot of vignetting. You might as well just get & use a K-mount manual lens & correct adapter.

01-10-2016, 03:01 PM - 1 Like	#6
pomabille New Member Join Date: Apr 2014 Location: Calgary, AB Posts: 15 Original Poster	Thanks a lot for your replies everyone! I suspected it wouldn't be that easy but I thought I'd check anyway.

01-10-2016, 04:49 PM	#7
Oldbayrunner Pentaxian Join Date: Mar 2013 Posts: 1,665	That's too good a lens to bastardize. Why not sell it and buy a lens that works with your Canon.