Sigma 20mm f/1.8 EX Aspherical DG DF RF AutoFocus Super Wide Angle Lens with Hood for Sigma Cameras - USA Warranty

2012-06-15T21:00:00

Very Sharp lens at the optimal apetures f/8-f/16 very good at f/7 f/5.6, good at f/4...a bit soft at f/1.8-f/2.8 and f/22, better at f/3/5-f/4. It's a heavy big lens solidly built but does the job. Works using infrared with no to min. hot spot when shooting towards the light source. Good close up feature with manual override switch and large focus ring.

Ricky

2012-03-04T19:00:00

I really can't think of anything good to say about this lens. After much research I decided to buy this lens. I saw a few reviews that said it was blurry, but there were considerably more good reviews. I tried the lens in a very well lit situation and it appeared to be crisp and clean on my LCD. When I downloaded the images to my computer and looked at the print size of the images they were all soft and blurry. Details like lips and eyes were undefined. The other thing I noticed was the lens had issues in auto focus, it wouldn't pick-up certain focal points and would keep searching for focal points. I should mention I am a professional photographer that has worked with a few good lenses and if you are a professional this lens will not be good enough. Stick with Canon their lenses were designed for their focusing system. I agree they are way over-priced, but I suppose that its worth it in the long run!

LUMINOUS P.

2011-02-20T19:00:00

I use it as my normal lens on the Sigma SD15 because the f1.8 max aperture provides a bright viewfinder. Focus is a bit twitchy because the distance scale is only about 3/4" long

saddle t.