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Compatitibility of Canon 5D with Sigma Lens

Helen Ellis , Mar 24, 2006; 02:30 p.m.

Please can you give me some advice. I have just purchased a Sigma DC EX 18mm - 50mm EX Lens. I was advised that this was a good quality lens to buy, by a representative from Sigma at the Foucs show in Birmingham. I have attached the lens to my Canon 5D and the image I get is quite concerning. The image appears in a circle. (it is as if the camera is incorporating the shape of the lens in the image) It has the effect of the image being vignetted around the edges. Can you advise me what the problem is, is this not a compatible lens?

Any information would be gratefully received.

Responses

Mario Monti , Mar 24, 2006; 02:37 p.m.

If it appears in a circle with a black ring, it would seem to me that the lens you purchased was for a cropped camera.

Sigma says: It is an ideal large aperture standard zoom lens for digital SLR cameras featuring APS-C size image sensor.

-Mario

Ryan McGill - Huntsville, AL , Mar 24, 2006; 02:38 p.m.

DC is not made for full frame sensors. However, DG Sigma lenses are. You may want to take it back and get a DG version.

Mario Monti , Mar 24, 2006; 02:38 p.m.

But perhaps someone else knows for sure...

-Mario

Ryan McGill - Huntsville, AL , Mar 24, 2006; 02:43 p.m.

Info from Sigma USA:

DG (DG Lens) These are large-aperture lenses with wide angles and short minimum focusing distances. With an abundance of peripheral illumination, they are ideal lenses for Digital SLR Cameras while retaining suitability for traditional 35mm SLRs. DC (DC Lens) These are special lenses designed so that the image circle matches the smaller size of the image sensor of most digital SLR cameras. Their specialized design gives these lenses the ideal properties for digital cameras, the compact and lightweight construction is an added bonus! Including compact and lightweight construction.

Darren Gold - Sydney, Australia , Mar 24, 2006; 02:52 p.m.

You are using a lens designed for an APS-C sensor (23 x 15mm) on a camera with a full frame (36 x 24mm) sensor. The image circle is not big enough to cover the sensor in your camera, so you get vignetting.

You need to use lenses designed for 35mm cameras.

Regards

Mark U , Mar 24, 2006; 03:03 p.m.

I hope you told the rep you had a CANON 5D (rather than a Konica Minolta 5D, for which the 18-50 lens would be an excellent choice). As you are I guess in the UK, I think you should be able to return the lens for a full refund as not being fit for purpose under the Sale of Goods Act.

Vincent J M , Mar 24, 2006; 09:31 p.m.

Your lens will NOT work on the 5D

The sigma 18-50 is meant for cameras with smaller sensors like the 20D or 350D. It WILL vignette on your 5D, 1D, 1Ds and any full frame camera. Give it back.

Diane Fields , Mar 25, 2006; 12:33 a.m.

As they said, however, the Sigma 15-30 is a quite nice lens on the 5D. I bought it a number of years ago for use with the D60 but was happy to find that it does well on FF.

Diane

Helen Ellis , Apr 17, 2006; 09:23 a.m.

THANKS TO EVERYONE FOR REPLYING. WITH YOUR GUIDANCE I GOT AN EXCHANGE TO A TAMRON 28-70 - STILL HAVING PROBLEMS THOUGH - BUT NOW WITH THE CLARITY OF THE PHOTOGRAPHS. I HAVE POSTED A NEW THREAD ON THIS (IN CANON EOS) SECTION

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