John <J...@nospam.com> writes: > I put the camera on a tripod and set the aperature to f22 using flash > and self-timer to eliminate any chance of shake. Still blurry.
> Is the Sigma *that* bad a lens?
Sounds like AF errors. How does the viewfinder image look?
>I bought a new Sigma DC zoom lens 17mm-70mm f2.8-4.5 for my new Canon XTi >(400D).
> The results are awful. Blurry like a cheapo camera.
> I changed the focal lengths and aperatures. No positive improvements.
> I put the camera on a tripod and set the aperature to f22 using flash and > self-timer to eliminate any chance of shake. Still blurry.
> Is the Sigma *that* bad a lens?
Switch to manual focus and see how it works. I wonder if the there is compatibility issues between the new Rebel model and the Sigma. I have had good luck with the optical quality of Sigma lenses I've used, but none were upgradeable to the digital cameras. One reason not to buy Sigma.
JohnR66 wrote: > "John" <J...@nospam.com> wrote in message > news:_SbXg.6965$gL.1481@southeast.rr.com... >>I bought a new Sigma DC zoom lens 17mm-70mm f2.8-4.5 for my new Canon XTi >>(400D).
>> The results are awful. Blurry like a cheapo camera.
>> I changed the focal lengths and aperatures. No positive improvements.
>> I put the camera on a tripod and set the aperature to f22 using flash and >> self-timer to eliminate any chance of shake. Still blurry.
>> Is the Sigma *that* bad a lens?
> Switch to manual focus and see how it works. I wonder if the there is > compatibility issues between the new Rebel model and the Sigma. I have had > good luck with the optical quality of Sigma lenses I've used, but none were > upgradeable to the digital cameras. One reason not to buy Sigma.
> At least give Sigma support a try. > John
I just got back from BestBuy after trying an experiment.
I brought my Canon XTi so that I could try out different lenses. I put in a Canon zoom lens (courtesy of BestBuy) into my camera and took a photograph of the interior of the store. Blurry.
I tried out the same lens on one of BestBuy's XTi's. Results much better. Switched back and forth a few times and my camera always came out blurry.
>I bought a new Sigma DC zoom lens 17mm-70mm f2.8-4.5 for my new Canon XTi >(400D).
> The results are awful. Blurry like a cheapo camera.
> I changed the focal lengths and aperatures. No positive improvements.
> I put the camera on a tripod and set the aperature to f22 using flash and > self-timer to eliminate any chance of shake. Still blurry.
> Is the Sigma *that* bad a lens?
John, that lens should be fine. However, the XTi is a new camera and perhaps the autofocus is not compatible. Contact Sigma. I assume manual focus works.
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