LensTip.com

Lens review

Tamron 24 mm f/2.8 Di III OSD M 1:2

30 June 2020
Maciej Lata³³o

7. Coma, astigmatism and bokeh

When it comes to coma correction, the Tamron 24 mm f/2.8 Di III OSD M 1:2 suprised us in a very pleasant way. On the smaller APS-C sensor we couldn't notice that aberration practically at all and in the corners of full frame it reached medium values at most. The 20 mm model fared equally well (or maybe even a tad better) in this category. It seems the series of fixed-focal f/2.8 Tamrons was optimized to correct well off-axis aberrations that influence point-like images of light.

Center, f/2.8 Corner APS-C, f/2.8 Corner FF, f/2.8
Tamron 24 mm f/2.8 Di III OSD M 1:2 - Coma, astigmatism and bokeh Tamron 24 mm f/2.8 Di III OSD M 1:2 - Coma, astigmatism and bokeh Tamron 24 mm f/2.8 Di III OSD M 1:2 - Coma, astigmatism and bokeh
Center, f/4.0 Corner APS-C, f/4.0 Corner FF, f/4.0
Tamron 24 mm f/2.8 Di III OSD M 1:2 - Coma, astigmatism and bokeh Tamron 24 mm f/2.8 Di III OSD M 1:2 - Coma, astigmatism and bokeh Tamron 24 mm f/2.8 Di III OSD M 1:2 - Coma, astigmatism and bokeh


Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 4.6% and we consider it on a borderline between very low and low levels. In this testing category the lens performs beyond reproach.


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The appearance of out-of-focus images provided by the tested Tamron is very sensible. We expected a weaker performance knowing that it is a wide-angle lens with a moderately fast aperture but now we have no serious reservations. The only thing that sticks out is a lighter rim which intensity increases on stopping down. Also the influence of mechanical vignetting makes itself felt, visible in corners of full frame even by f/5.6; still we are going to deal with effects connected to that aberration in the next chapter.

Center, f/2.8 Corner APS-C, f/2.8 Corner FF, f/2.8
Tamron 24 mm f/2.8 Di III OSD M 1:2 - Coma, astigmatism and bokeh Tamron 24 mm f/2.8 Di III OSD M 1:2 - Coma, astigmatism and bokeh Tamron 24 mm f/2.8 Di III OSD M 1:2 - Coma, astigmatism and bokeh
Center, f/4.0 Corner APS-C, f/4.0 Corner FF, f/4.0
Tamron 24 mm f/2.8 Di III OSD M 1:2 - Coma, astigmatism and bokeh Tamron 24 mm f/2.8 Di III OSD M 1:2 - Coma, astigmatism and bokeh Tamron 24 mm f/2.8 Di III OSD M 1:2 - Coma, astigmatism and bokeh
Center, f/5.6 Corner APS-C, f/5.6 Corner FF, f/5.6
Tamron 24 mm f/2.8 Di III OSD M 1:2 - Coma, astigmatism and bokeh Tamron 24 mm f/2.8 Di III OSD M 1:2 - Coma, astigmatism and bokeh Tamron 24 mm f/2.8 Di III OSD M 1:2 - Coma, astigmatism and bokeh