LensTip.com

Lens review

Canon EF 50 mm f/1.8 II

21 January 2015
Arkadiusz Olech

7. Coma, astigmatism and bokeh

As long as you work on the small APS-C sensor the coma won’t be bothersome almost at all. Significant problems the lens encounters only in the corners of full frame where the coma level is really huge. Mind you it’s not end of bad news. Even on stopping down the aperture to f/2.5 the problem remains serious as you don’t see that aberration level decreasing. However, in order to defend the Canon a bit you should add that the newer constructions such as the Nikkor AF-S 50 mm f/1.8G don’t fare in this category better.

Center, f/1.8 APS-C corner, f/1.8 FF corner, f/1.8
Canon EF 50 mm f/1.8 II - Coma, astigmatism and bokeh Canon EF 50 mm f/1.8 II - Coma, astigmatism and bokeh Canon EF 50 mm f/1.8 II - Coma, astigmatism and bokeh
Center, f/2.5 APS-C corner, f/2.5 FF corner, f/2.5
Canon EF 50 mm f/1.8 II - Coma, astigmatism and bokeh Canon EF 50 mm f/1.8 II - Coma, astigmatism and bokeh Canon EF 50 mm f/1.8 II - Coma, astigmatism and bokeh


The situation with the astigmatism correction is much nicer. The average difference between horizontal and vertical MTF50 function values amounted to 6.2% which is a good result, in fact quite close to very good. It’s also worth adding that the astigmatism is noticeable only by f/1.8 and f/2.0 ; from f/2.8 upwards it becomes negligible.


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When it comes to the appearance of defocused images our impressions are divided. We like very even light spread, visible in the circles, without any borders, concentric rims or brightness decrease on the edges. Unfortunately that positive image is spoiled by the aperture with only five diaphragm blades and very high vignetting which makes the circles truncated in the frame corners.

Center, f/1.8 APS-C corner, f/1.8 FF corner, f/1.8
Canon EF 50 mm f/1.8 II - Coma, astigmatism and bokeh Canon EF 50 mm f/1.8 II - Coma, astigmatism and bokeh Canon EF 50 mm f/1.8 II - Coma, astigmatism and bokeh
Center, f/2.5 APS-C corner, f/2.5 FF corner, f/2.5
Canon EF 50 mm f/1.8 II - Coma, astigmatism and bokeh Canon EF 50 mm f/1.8 II - Coma, astigmatism and bokeh Canon EF 50 mm f/1.8 II - Coma, astigmatism and bokeh
Center, f/3.5 APS-C corner, f/3.5 FF corner, f/3.5
Canon EF 50 mm f/1.8 II - Coma, astigmatism and bokeh Canon EF 50 mm f/1.8 II - Coma, astigmatism and bokeh Canon EF 50 mm f/1.8 II - Coma, astigmatism and bokeh