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Sigma 30mm F1.4 EX DC HSM

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Review Date: Oct 25, 2007 Recommend? no | Price paid: $400.00 | Rating: 7 

 
Pros: Sharp, fast, cheap
Cons:
Focus problem with Canon mount

I loved this lens when I had it mounted on XTI. The pics were nicely saturated and very sharp. It's very usable indoor.

However, when I upgraded to 40D, I got severe front focusing issue. Sending it to sigma made it worse even though they said 'it was re-calibrated to spec'. They did suggest me to send my camera body so they can adjust it to the body. However this makes the lens not compatible with non 40D bodies (ie the focus cannot be guaranteed sharp anymore).
Note: The 40D has no problem with other 3 canon lenses.

I guess this is the risk of buying non-OEM lens.