LensTip.com

Lens review

Canon EF 28 mm f/1.8 USM

6 July 2010
Arkadiusz Olech

8. Vignetting

If we decide to use the Canon 1.8/28 as a relatively fast standard lens, cooperating with an APS-C class sensor, we shouldn’t have almost any reason to complain about its vignetting level. It can be clearly seen in the pictures below.

Canon EF 28 mm f/1.8 USM - Vignetting


At the maximum relative aperture the brightness loss in the frame corners reaches 22% (-0.73 EV). Although this value is noticeable, it shouldn’t disturb us in the case of most applications. On stopping down to f/2.0 the vignetting decreases to 15% and by f/2.8 it becomes completely imperceptible (9%).


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Of course the full frame sensor will raise standards quite significantly in this category. The photos below show it very well.

Canon EF 28 mm f/1.8 USM - Vignetting


If we decide to take photos at the maximum relative aperture we must take into account the fact that we will lose 52% of light in the frame corners (-2.14 EV). On stopping down to f/2.0 the brightness loss decreases slightly because then its value amounts to 45%. By f/2.8 the light fall-off in the corners reaches still noticeable level of 28%. We will be able to perceive this aberration also by f/4.0 where it is 22%. On further stopping down the aperture we don’t see any measurable vignetting decrease.

What’s interesting, the Canon 1.8/28, although distinctly smaller than the Sigma 1.8/28, copes with the vignetting better.


Canon EF 28 mm f/1.8 USM - Vignetting