Here, we can accuse Sigma of too many good intentions. What is an HSM motor in a “fisheye” class lens for when, in many cases, the depth of field is so deep that the focusing simply doesn’t make sense? As a formality we note that the autofocus works quickly, silently and is very accurate (the number of serious errors in the studio condition reached just 3%). It is also worth notice that the distance scale has the range from 0.135 metre to infinity and to travel the full range you must rotate the ring about 100 degrees. At minimal focus length you can photograph objects which are situated even 1.8 cm before the front element! We don’t have to add what range of possibilities it creates for imaginative people.
The fact that the f/2.8 aperture could be used and the test chart could be positioned really close made me write here something I have never expected to write in a “fisheye” lens test. The Sigma 2.8/10 has a frontfocus tendency. It’s a bit silly but, as you see in the picture below, true. It’s again pure formality, though, because you would be hard-pressed to find a real life situation in which that frontfocus could prevent you from taking a good picture.
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