Tamron 17-35 mm f/2.8-4 Di OSD review - Coma, astigmatism and bokeh

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Tamron 17-35 mm f/2.8-4 Di OSD

18 February 2019

Arkadiusz Olech

7. Coma, astigmatism and bokeh

As long as you work with the smaller APS-C/DX sensor you won’t have any coma-related problems. If you look closely at diode images in the corners of full frame, though, you’ll notice deformations; fortunately they aren’t especially pronounced. The degree of coma correction of the Tamron 17-35 mm can be described as bordering low and medium values.

Center, 17 mm, f/2.8	corner APS-C, 17 mm, f/2.8	corner FF, 17 mm, f/2.8

Center, 26 mm, f/3.5	corner APS-C, 26 mm, f/3.5	corner FF, 26 mm, f/3.5

Center, 35 mm, f/4.0	corner APS-C, 35 mm, f/4.0	corner FF, 35 mm, f/4.0

Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 3.1% and it is a value we consider to be very low.

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When it comes to defocused circles of light we don’t have any reasons to complain. You can perceive a weak influence of mechanical vignetting and a slightly accented rim but these are, in fact, the only things that draw our attention, and they can hardly be called bothersome.

Center, 35 mm, f/4.0	corner APS-C, 35 mm, f/4.0	corner FF, 35 mm, f/4.0

Center, 35 mm, f/5.6	corner APS-C, 35 mm, f/5.6	corner FF, 35 mm, f/5.6

Center, 35 mm, f/8.0	corner APS-C, 35 mm, f/8.0	corner FF, 35 mm, f/8.0