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This Sigma is not good
On Fri, 19 Jun 2020 13:13:19 +0200, Paul Carmichael
wrote: The Sigma 120-400mm 5.6 is the only tele/autofocus that I have. My other lenses are mostly Samyang primes. FYI, Review of the lens at imaging-resource.com https://www.imaging-resource.com/len...sm-apo/review/ Sharpness The 120-400mm is a fairly sharp lens, but its performance is optimized for the wider range of its focal length spectrum. As you zoom in towards the 400mm range, image sharpness degrades significantly. |
#2
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This Sigma is not good
On Sun, 21 Jun 2020 15:23:09 -0400, me wrote:
On Fri, 19 Jun 2020 13:13:19 +0200, Paul Carmichael wrote: The Sigma 120-400mm 5.6 is the only tele/autofocus that I have. My other lenses are mostly Samyang primes. FYI, Review of the lens at imaging-resource.com https://www.imaging-resource.com/len...sm-apo/review/ Sharpness The 120-400mm is a fairly sharp lens, but its performance is optimized for the wider range of its focal length spectrum. As you zoom in towards the 400mm range, image sharpness degrades significantly. and Between 300 and 400mm, performance when used wide open (ƒ/5.6) is nothing to write home about - very uneven and soft (3-5 blur units at 300mm, and 5-8 units at 400mm). Stopping down to ƒ/8 or ƒ/11 is necessary to get any kind of sharpness out of the lens at this focal length. Interestingly, image sharpness is better at ƒ/22-29 than when used wide open at these focal lengths. |
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