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Lens review

Canon EF 24-105 mm f/3.5-5.6 IS STM

28 May 2015
Szymon Starczewski

7. Coma, astigmatism and bokeh

It would be difficult to notice the coma on the small APS-C sensor but in the corners of full frame that aberration makes itself felt. While you cannot call its level high, it remains easy to spot in the 24-40 mm focal range and is a bit less conspicuous in the 70-105 mm focal range. Overall the performance in this category is not that bad.

Center, 24 mm, f/3.5 Corner APS-C, 24 mm, f/3.5 Corner FF, 24 mm, f/3.5
Canon EF 24-105 mm f/3.5-5.6 IS STM - Coma, astigmatism and bokeh Canon EF 24-105 mm f/3.5-5.6 IS STM - Coma, astigmatism and bokeh Canon EF 24-105 mm f/3.5-5.6 IS STM - Coma, astigmatism and bokeh
Center, 40 mm, f/4.0 Corner APS-C, 40 mm, f/4.0 Corner FF, 40 mm, f/4.0
Canon EF 24-105 mm f/3.5-5.6 IS STM - Coma, astigmatism and bokeh Canon EF 24-105 mm f/3.5-5.6 IS STM - Coma, astigmatism and bokeh Canon EF 24-105 mm f/3.5-5.6 IS STM - Coma, astigmatism and bokeh
Center, 70 mm, f/5.6 Corner APS-C, 70 mm, f/5.6 Corner FF, 70 mm, f/5.6
Canon EF 24-105 mm f/3.5-5.6 IS STM - Coma, astigmatism and bokeh Canon EF 24-105 mm f/3.5-5.6 IS STM - Coma, astigmatism and bokeh Canon EF 24-105 mm f/3.5-5.6 IS STM - Coma, astigmatism and bokeh
Center, 105 mm, f/5.6 Corner APS-C, 105 mm, f/5.6 Corner FF, 105 mm, f/5.6
Canon EF 24-105 mm f/3.5-5.6 IS STM - Coma, astigmatism and bokeh Canon EF 24-105 mm f/3.5-5.6 IS STM - Coma, astigmatism and bokeh Canon EF 24-105 mm f/3.5-5.6 IS STM - Coma, astigmatism and bokeh


The astigmatism, understood as an average difference between horizontal and vertical MTF50 function values and computed across the whole focal lengths, looks sensible as its value is 6.1%. Still it must be remembered there are places where it can be bothersome. For example at the maximum relative aperture and at 40 mm it is able to reach 16% and at the shortest focal length it gets to 12%.

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The blurred area doesn’t look bad for such a low-budget zoom lens. The circles are not especially truncated by the vignetting and the light spread inside them is more or less even. You can notice some local extremes but, fortunately, they are not very distinct.

Center, 105 mm, f/5.6 Corner APS-C, 105 mm, f/5.6 Corner FF, 105 mm, f/5.6
Canon EF 24-105 mm f/3.5-5.6 IS STM - Coma, astigmatism and bokeh Canon EF 24-105 mm f/3.5-5.6 IS STM - Coma, astigmatism and bokeh Canon EF 24-105 mm f/3.5-5.6 IS STM - Coma, astigmatism and bokeh
Center, 105 mm, f/8.0 Corner APS-C, 105 mm, f/8.0 Corner FF, 105 mm, f/8.0
Canon EF 24-105 mm f/3.5-5.6 IS STM - Coma, astigmatism and bokeh Canon EF 24-105 mm f/3.5-5.6 IS STM - Coma, astigmatism and bokeh Canon EF 24-105 mm f/3.5-5.6 IS STM - Coma, astigmatism and bokeh
Center, 105 mm, f/11.0 Corner APS-C, 105 mm, f/11.0 Corner FF, 105 mm, f/11.0
Canon EF 24-105 mm f/3.5-5.6 IS STM - Coma, astigmatism and bokeh Canon EF 24-105 mm f/3.5-5.6 IS STM - Coma, astigmatism and bokeh Canon EF 24-105 mm f/3.5-5.6 IS STM - Coma, astigmatism and bokeh