Paul Lawrence wrote: > The sigma covers a full 35mm frame but I understand there is some > distortion at the edges when using a full 35mm frame.
It's soft in the edges, not distorted. I'm currently waiting for a replacement of a defective one, but my initial tests showed similar results to Pop Photo, who published a test in the current issue. Corners soft at all apertures, center quite sharp at all apertures, astoundingly low distortion at all focal lengths. I photographed the Adobe building at 12mm with a 1Ds, then put a line in Photoshop down a building edge near the frame edge -- I was stunned to see no visible distortion on the screen resolution display. Pop measured 0.22% barrel at 12mm and 0.93% pincushion at 24mm. With the 10D-size sensor, Pop measured 0-10% resolution falloff at edges from center resolution at all apertures. The one significant drawback is inability to use normal filters on full-frame cameras because of bulbous front element. Bottom line: fabulous lens for APS-size sensor cameras, amazing one for full frame if you can live with soft corners. Russell =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
