Problem with Sigma 30 f/1.4 (electronic noise)

Started Dec 12, 2010 | Discussions thread
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BoredAtWork
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Problem with Sigma 30 f/1.4 (electronic noise)
Dec 12, 2010

guys,

I have a problem. I bought a Sigma 30mm f1.4 a few days ago. Working out great for photos and focus is pretty much dead on.

However, when I view photos at 100% crop, I see ALOT of noise / sparkles in the photos. It looks like hot pixels. It seems to be related to ISO levels (increases with ISO settngs).

I have done testing back to back with use the same exposure settings and shutter speed on a 18-55 kit lens, testing back to back, and the difference is very obvious in dark areas of the shots.

Is this normal? Here is what it looks like, 100% crop, sigma on the left, 18-55 on the right.

Setting is 1/30 sec, IS400, f4.

Can anyone help? Normal? Shoud I return it?

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