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rowan · 02-23-2010, 12:50 AM

I've had a couple of Sigma 12-24mm lens... they use ultrasonic focusing so it's fast and near silent. I think they're still the widest rectilinear lenses available for full frame cameras.

BTW, the lower end Canon lenses don't use ultrasonic motors so they also make a screeching noise...

02-23-2010, 12:50 AM
rowan Too lazy to set a custom title Join Date: Mar 2002 Location: Australia Posts: 17,393	I've had a couple of Sigma 12-24mm lens... they use ultrasonic focusing so it's fast and near silent. I think they're still the widest rectilinear lenses available for full frame cameras. BTW, the lower end Canon lenses don't use ultrasonic motors so they also make a screeching noise...