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Sigma Lens Question
Old 01-05-2007, 10:09 PM   #1 (permalink)
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I know Sigma at one time had compatability problems with Canon bodies mainly because Sigma reversed their lenses and they didn't have the complete technology because they didn't license it from Canon. From what I have read the new line of Sigma "DG" lenses corrects the compatability problems and supposedly work fully well with the Canon bodies. Also, from what I remember one of the last Canon bodies that Sigma had problems with was the Elan 7 film body (which I own as a backup to my digital bodies).

I have been looking seriously at a couple of the new Sigma "DG" lenses and I have been unable to find out if the new "DG" lenses are fully compatible with the full line of Canon bodies. I know the "DG" bodies are supposedly fully compatible with all of the Canon digital bodies and from what I understand this compatibility extends to the Canon film bodies but I am curious as to why it was the Elan 7 that gave Sigma such trouble and have they resolved the compatibility issues with their lenses and the Canon Elan 7.

If anyone has information or experiences about this that they will share with me it will make me parting with my money a lot easier and will give me peace of mind in my purchase. Thanks to all.
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Re: Sigma Lens Question
Old 01-05-2007, 10:45 PM   #2 (permalink)
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It my understanding that the DG designation means they have been optimized for digital cameras and will still work on all of the Canon bodies of the past. That is assuming no chip problems. I would recommend checking at a local camera store to see if a lens you're interested in will work with the Elan. I personally use a Canon 10D and 20D and use two sigma lens, 17-125 f3.5-6.3 and 70-200 f2.8. Both have worked great on both cameras with no problems with compatibility. I did have to send my 17-125 back for repair and apparently they think it was exposed to sea water (I was in the VI, so that may have been it). The 17-125 is a DG lens while the 70-200 is the older non-dg version. But in head to head tests with the Canon 70-200 f2.8 it the version I have was rated as virtual dead heat.

Be aware, however, that there is another designation of Sigma Digital lens called DC. The DC lens are only compatible with the Canon cameras that have the 1.6 x crop factor.

Here is a photo with each lens above:

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Re: Sigma Lens Question 


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Re: Sigma Lens Question 


cheers,
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Re: Sigma Lens Question
Old 01-08-2007, 11:05 PM   #3 (permalink)
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Compatability will not really be a problem until Canon updates it's bodies. Then all bets may be off. This is a common problem with aftermarket lens on either Canon or Nikon bodies. For example what I call first generation AF lens from Tamron would work fine on a Nikon F90 but wouldn't work on the Nikon F80 or any of the newer digital bodies. The chip in the lens was the problem. Yes they could be sent back and re-chipped. ( at the time).

So for what its worth, buy what you're going to use today and not worry about the future. There is usually a reason, maybe more than one, why a lens is cheaper.
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