+- Opticallimits (https://forum.opticallimits.com)
+-- Forum: Forums (https://forum.opticallimits.com/forumdisplay.php?fid=4)
+--- Forum: Sony (https://forum.opticallimits.com/forumdisplay.php?fid=14)
+--- Thread: Next OL lens lab test - Tamron 20mm f/2.8 Di III OSD M1:2 (/showthread.php?tid=5105)
Next OL lens lab test - Tamron 20mm f/2.8 Di III OSD M1:2 - Klaus - 08-07-2021
Unsurprisingly the worst of the gang but still decent for a 20mm lens.
https://opticallimits.com/sonyalphaff/1116-tamron20f28
FWIW, I've added a sunstars chapter and another bokeh sample to the other two reviews as well.
RE: Next OL lens lab test - Tamron 20mm f/2.8 Di III OSD M1:2 - stoppingdown - 08-07-2021
It's a fair lens, in the end, as you stated in the price/performance evaluation. I see that you confirm that at ƒ/4 the light spots are "almost" circular, but not as circular as the advertising promised. It's probably the single thing that I was disappointed by.
For what concerns distortion and relatead loss of sharpness, it's a lesser problem if a) you use it on a APS-C camera b) you're doing macro (which means you most likely want blurred things around the subject) and c) you use a partial correction profile. With the last point I mean that you can reduce the distortion correction in post-processing if you are not shooting architecture (c-plan with this lens for me).
RE: Next OL lens lab test - Tamron 20mm f/2.8 Di III OSD M1:2 - Rover - 08-07-2021
(Trying to) find a bright side: the distortion is still fully a percent (and then some) less than the result posted by EPZ.
That aside, the lens still looks better than the old Sigma 20/1.8 or the Canon 20/2.8, though these were old DSLR lenses of course. The new crop of twenties is a lot better, which is also unsurprising.