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DPChallenge Forums >> Hardware and Software >> Canon EOS 6D with Sigma 10-20mm
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04/17/2013 09:36:41 AM · #1
As per the documentation Sigma 10-20mm does support Full frame body BUT now I am lost,

See below two photographs, one with Canon EOS 6D with Sigma 10-20mm and another one with Canon EOS 50D (crop body) with Sigma 10-20mm. even though I was at 20mm with 6D, I am seeing a big vignetting where as with 50D it does not show any. Does this not mean that Sigma 10-20mm is NOT compatible with Full frame body? if that is true then it is false information that Sigma is sending out, isn't it?

Also did anyone see any issue with 5D Mii or Miii when it comes to Sigma 10-20mm?

Canon EOS 6D with Sigma 10-20mm

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Canon EOS 50D (Crop body) with Sigma 10-20mm

' . substr('//girishpandit.com/portfolio/wp-content/uploads/2013/04/Trial_3.png', strrpos('//girishpandit.com/portfolio/wp-content/uploads/2013/04/Trial_3.png', '/') + 1) . '

Message edited by author 2013-04-17 09:37:11.
04/17/2013 09:45:23 AM · #2
I'm no expert, but I'd say that it's physically compatible but not photographically compatible. At what zoom does the vignetting start?
04/17/2013 09:47:04 AM · #3
Originally posted by mikeee:

I'm no expert, but I'd say that it's physically compatible but not photographically compatible. At what zoom does the vignetting start?


Confirmed here. It will fit but once you get wider than about 13mm you will get the vignetting.

Edited to fix link

Message edited by author 2013-04-17 10:57:47.
04/17/2013 09:49:30 AM · #4
Originally posted by MarkB:

Originally posted by mikeee:

I'm no expert, but I'd say that it's physically compatible but not photographically compatible. At what zoom does the vignetting start?


Confirmed here. It will fit but once you get wider than about 13mm you will get the vignetting.


Mark, need to fix the link :)

About the Vignetting, when I am at 10mm view finder will show me that I need to zoom me to get away with dark circles now when I am at 20mm, view finder does not show me any side effects but when it comes down to photograph I still see vignetting.
04/17/2013 10:10:50 AM · #5
From DPReview's test of the lens:

Originally posted by dpreview:

Headline features

Ultra-wideangle zoom (15-30mm equivalent on 1.5x DX / APS-C DSLRs)
F4-5.6 maximum aperture
Available for Canon, Nikon, Sigma and Four Thirds mounts with built-in HSM focusing motor, and Pentax and Sony mounts with focus driven from camera body (non-HSM version)
For reduced frame (APS-C / DX / Four Thirds) format DSLRs only


What you're seeing is an image circle that will only cover APS-C sensors and smaller.
04/17/2013 10:12:39 AM · #6
Originally posted by Bear_Music:

From DPReview's test of the lens:

Originally posted by dpreview:

Headline features

Ultra-wideangle zoom (15-30mm equivalent on 1.5x DX / APS-C DSLRs)
F4-5.6 maximum aperture
Available for Canon, Nikon, Sigma and Four Thirds mounts with built-in HSM focusing motor, and Pentax and Sony mounts with focus driven from camera body (non-HSM version)
For reduced frame (APS-C / DX / Four Thirds) format DSLRs only


What you're seeing is an image circle that will only cover APS-C sensors and smaller.


Thanks Robert! that means even though it fits to 6D, there is no use of this lens :(
04/17/2013 10:16:48 AM · #7
Originally posted by pgirish007:

Thanks Robert! that means even though it fits to 6D, there is no use of this lens :(

Pretty much, yeah...
04/17/2013 10:25:39 AM · #8
Originally posted by pgirish007:

Originally posted by Bear_Music:

From DPReview's test of the lens:

Originally posted by dpreview:

Headline features

Ultra-wideangle zoom (15-30mm equivalent on 1.5x DX / APS-C DSLRs)
F4-5.6 maximum aperture
Available for Canon, Nikon, Sigma and Four Thirds mounts with built-in HSM focusing motor, and Pentax and Sony mounts with focus driven from camera body (non-HSM version)
For reduced frame (APS-C / DX / Four Thirds) format DSLRs only


What you're seeing is an image circle that will only cover APS-C sensors and smaller.


Thanks Robert! that means even though it fits to 6D, there is no use of this lens :(

Check your menus. My Nikon has an ability to self-crop its own sensor so that DX lenses can be used without vignetting. You sacrifice sensor real estate and therefore have an image with fewer pixels, but you'll get rid of this problem.
04/17/2013 10:33:02 AM · #9
can you use an extender?
04/17/2013 10:37:02 AM · #10
Originally posted by pgirish007:

Thanks Robert! that means even though it fits to 6D, there is no use of this lens :(

I would not say "no use". I have the same issue using my Tamron 10-24mm on a full frame camera. It mounts the camera fine, and it works fine in a range of about 13-24mm. At 13mm you essentially get the same image as you would at 10mm on a crop sensor. It is pretty worthless in the 10-13mm range.

ETA: Here is my recent entry in Leading Lines shot at 14mm on a full frame camera.
' . substr('//images.dpchallenge.com/images_challenge/1000-1999/1731/120/Copyrighted_Image_Reuse_Prohibited_1062344.jpg', strrpos('//images.dpchallenge.com/images_challenge/1000-1999/1731/120/Copyrighted_Image_Reuse_Prohibited_1062344.jpg', '/') + 1) . '

Message edited by author 2013-04-17 10:40:07.
04/17/2013 10:38:10 AM · #11
Originally posted by bohemka:

Originally posted by pgirish007:

Originally posted by Bear_Music:

From DPReview's test of the lens:

Originally posted by dpreview:

Headline features

Ultra-wideangle zoom (15-30mm equivalent on 1.5x DX / APS-C DSLRs)
F4-5.6 maximum aperture
Available for Canon, Nikon, Sigma and Four Thirds mounts with built-in HSM focusing motor, and Pentax and Sony mounts with focus driven from camera body (non-HSM version)
For reduced frame (APS-C / DX / Four Thirds) format DSLRs only


What you're seeing is an image circle that will only cover APS-C sensors and smaller.


Thanks Robert! that means even though it fits to 6D, there is no use of this lens :(

Check your menus. My Nikon has an ability to self-crop its own sensor so that DX lenses can be used without vignetting. You sacrifice sensor real estate and therefore have an image with fewer pixels, but you'll get rid of this problem.

Wow, I just read that Canon doesn't offer this, rendering all EF-S lenses obsolete for full frame sensors. Not very nice.
04/17/2013 10:49:11 AM · #12
Originally posted by Mike:

can you use an extender?


I haven't tried but will give it a shot!
04/17/2013 10:50:59 AM · #13
I sold my Tokina 12-24 F4.0 yesterday. I knew since I bought it that fits and can mount on APS but will have the strong vignetting. Also sold my Tamron 28-75 F2.8 I loved them both

Message edited by author 2013-04-17 10:55:23.
04/17/2013 10:51:37 AM · #14
Originally posted by bohemka:

Originally posted by bohemka:

Originally posted by pgirish007:

Originally posted by Bear_Music:

From DPReview's test of the lens:

Originally posted by dpreview:

Headline features

Ultra-wideangle zoom (15-30mm equivalent on 1.5x DX / APS-C DSLRs)
F4-5.6 maximum aperture
Available for Canon, Nikon, Sigma and Four Thirds mounts with built-in HSM focusing motor, and Pentax and Sony mounts with focus driven from camera body (non-HSM version)
For reduced frame (APS-C / DX / Four Thirds) format DSLRs only


What you're seeing is an image circle that will only cover APS-C sensors and smaller.


Thanks Robert! that means even though it fits to 6D, there is no use of this lens :(

Check your menus. My Nikon has an ability to self-crop its own sensor so that DX lenses can be used without vignetting. You sacrifice sensor real estate and therefore have an image with fewer pixels, but you'll get rid of this problem.

Wow, I just read that Canon doesn't offer this, rendering all EF-S lenses obsolete for full frame sensors. Not very nice.


There is a reason why. :)

Many EF-S lenses have a back element that is deeper in the camera body than the EF specification allows for. Because of this, if EF-S lenses were able to mount on EF only FF bodies, then the mirror would physically interfere with the lens element, and would likely break the mirror, and damage the lens.

04/17/2013 10:57:11 AM · #15
Fixed the link from my earlier post. Thread on how someone overcame the issue by using a TC.
04/17/2013 11:08:10 AM · #16
You should get rid of that 6D, junk. If you send it to me, I will pay postage.
04/17/2013 11:22:03 AM · #17
I'm really sorry to hear that. Nikon D600 has a DX crop that allows the use of lenses that are not designed to be mounted on a full-frame camera. To tell the truth you can crop it afterwards... sometimes I do that to use a bigger area of the image. When I use longer lenses I don't even need it since that are no vignettes - that's I have done with this image:

' . substr('//images.dpchallenge.com/images_challenge/1000-1999/1714/120/Copyrighted_Image_Reuse_Prohibited_1055957.jpg', strrpos('//images.dpchallenge.com/images_challenge/1000-1999/1714/120/Copyrighted_Image_Reuse_Prohibited_1055957.jpg', '/') + 1) . '

After 60-70mm. there was no sign of a vignette.
04/17/2013 12:24:27 PM · #18
Originally posted by Tiberius:

I sold my Tokina 12-24 F4.0 yesterday. I knew since I bought it that fits and can mount on APS but will have the strong vignetting. Also sold my Tamron 28-75 F2.8 I loved them both


I have 50D too so in certain situation 10-20mm helps me. I know I can have another wide angle lens that goes well with the 6D but since I am going to keep 50D, I will keep 10-20mm too!
04/17/2013 12:34:46 PM · #19
There is a complex hack that can be done to shave off the back of the Canon EF-S 10-22 so that it can fit bigger than C sensors, without having the mirror smash into the rear element of the lens. It involves sawing bits off the rear of the lens and limiting the zoom range so the back of the lens barely clears the mirror. The results are similar to your shots above. When Sigma said their lens fit on a full body, I think they were trying to attract the crowd that were thinking of going Canon and doing the hack. I can tell you that it is disquieting to know that you have a lens in your bag that if you mount it on the wrong body will break your camera.
04/17/2013 01:50:32 PM · #20
Originally posted by BrennanOB:

I can tell you that it is disquieting to know that you have a lens in your bag that if you mount it on the wrong body will break your camera.


I thought the Canon branded EF-S mounts had a rubber plate that intentionally got in the way so it can not physically be attached to a full frame mount plate. I assume part of the 10-22 conversion removes this additional rubber plate?
04/17/2013 01:55:38 PM · #21
Originally posted by BrennanOB:

...When Sigma said their lens fit on a full body, I think they were trying to attract the crowd that were thinking of going Canon and doing the hack. I can tell you that it is disquieting to know that you have a lens in your bag that if you mount it on the wrong body will break your camera.


I think you are correct... there are plenty of folks that will push "APS" lenses onto FF, and stop at almost nothing to make the "Frankenstein" combination work, LOL.
From Canon's perspective, they knew that pushing the rear element into the body would give them optical advantage, at the cost of incompatibility with FF bodies. And so the EF-S mount was born. Nikon took a different path, maintaining mechanical compatibility and allowing shooting a FF camera in APS-C mode. Personally, I think both approaches have merit. I don't really ever care to shoot my FF camera as APS-C, so speaking only for myself, Canon's decision is perfectly fine with me.
FWIW, the Canon EOS mount is one of the most flexible on the market, due to the short register distance (flange-to-sensor distance). The EOS system can accept more other-system lenses than any other 35mm mount.
04/17/2013 02:01:16 PM · #22
Originally posted by kirbic:

I don't really ever care to shoot my FF camera as APS-C, so speaking only for myself, Canon's decision is perfectly fine with me.


The decision can be fine but, for instance, I can use an ultra wide angle lens for my video shootings, with Canon I couldn't do it with my Samyang 8mm.
04/17/2013 07:23:23 PM · #23
Originally posted by pgirish007:

Originally posted by Tiberius:

I sold my Tokina 12-24 F4.0 yesterday. I knew since I bought it that fits and can mount on APS but will have the strong vignetting. Also sold my Tamron 28-75 F2.8 I loved them both


I have 50D too so in certain situation 10-20mm helps me. I know I can have another wide angle lens that goes well with the 6D but since I am going to keep 50D, I will keep 10-20mm too!


You should! My 40D was stolen otherwise would definitely keep it alongside with the Tammy.
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