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Canon 5D Mk II - Sigma lenses with black rings?

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Cade Loven
Canon 5D Mk II - Sigma lenses with black rings?
on Aug 24, 2013 at 8:25:33 pm

Hello Friends!

I've been shooting video on the 5D Mk II with the Canon EF 50mm F1.8 lens and I have had great success with it.

I just bought a Sigma 17-70mm F2.8-4.5 Macro zoom lens and a Sigma 18-200mm F3.5-6.3 zoom lens -- they mount on the 5D body just fine, but there are these black rings that appear around the image and I have no idea what they are. This occurs with both of the Sigma lenses. There is an image below.

Does this have something to do with the full-HD sensor on the 5D vs. crop-sensor lenses? I don't really understand why there should be a difference if that is the case.

Canon EOS Mark II
Shutter Speed 1/40
Aperture 1/4
ISO 320
Focal Length 28mm

Shot with the Sigma 18-200mm F3.5-6.3 DC



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Warren Eig
Re: Canon 5D Mk II - Sigma lenses with black rings?
on Aug 25, 2013 at 5:42:28 pm

Yes this has everything to do with a crop sensor lens. The Circle of Confusion is too small to project onto a full size sensor. You are seeing the cropped Circle of Confusion.

Warren Eig
O 310-470-0905


email: warren@babyboompictures.com
website: http://www.babyboompictures.com


REEL: http://www.babyboompictures.com/BabyBoomPictures/Reels.html




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Ryan Holmes
Re: Canon 5D Mk II - Sigma lenses with black rings?
on Aug 28, 2013 at 4:42:31 pm

In the future you'll need to verify that the lens your buying will properly cover a full-frame sensor. The lens you bought is appropriate for a crop-sensor camera - like on a 60D, 70D, 7D, t4i, etc. you won't have any problems. In post you could scale up the footage to get rid of the black ring.

Or there's the reshoot filter! :-D

Ryan Holmes
http://www.ryanholmes.me
@CutColorPost


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