Low Light Tips?

Wow, what a very difficult shooting scenario. Maybe you should get your lens calibrated. You might even tell them to optimize it for wide-open shooting.

javaprog wrote in post #5347840
Maybe you should get your lens calibrated. You might even tell them to optimize it for wide-open shooting.

Whut?

René Damkot wrote in post #5350191
Whut?

I recently bought a Sigma lens that just didn't look sharp. I read in a thread that others were having some problems with it too. People experienced problems with front focus or back focus or internal lens element miss-alignment. I sent mine to Sigma and it came back a good bit sharper. They did it under warrenty.

There is a focus test you can do by printing out a document, choosing the center focal point only, and taking a picture. http://focustestchart.​com/chart.html

As for calibrating it be sharper wide open vs. stopped down... that's pure guess work on my part.