LensTip.com

Lens review

Carl Zeiss Batis 40 mm f/2 CF

28 August 2020
Maciej Latałło

8. Vignetting

First let's check the vignetting level on the smaller APS-C sensor – appropriate thumbnails you can find below.

A7R II, APS-C, f/2.0 A7R II, APS-C, f/2.8
Carl Zeiss Batis 40 mm f/2 CF  - Vignetting Carl Zeiss Batis 40 mm f/2 CF  - Vignetting


In this case only at the maximum relative aperture you get any chances to notice vignetting as it amounts to 24% (−0.81 EV). By f/2.8 it disappear practically completely, decreasing to 8% (−0.24 EV).


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On passing to the bigger full frame sensor there are far more problems as you can notice while glancing at photos below.

A7R II, FF, f/2.0 A7R II, FF, f/2.8
Carl Zeiss Batis 40 mm f/2 CF  - Vignetting Carl Zeiss Batis 40 mm f/2 CF  - Vignetting
A7R II, FF, f/4.0 A7R II, FF, f/5.6
Carl Zeiss Batis 40 mm f/2 CF  - Vignetting Carl Zeiss Batis 40 mm f/2 CF  - Vignetting


The result we got at the maximum relative aperture is 55% (−2.28 EV). It's a lot but in the case of a lens designed for mirrorless Sony cameras we've seen far weaker results and they concerned even lenses slower aperture-wise than the Batis, tested here. In other words it's not someting you should terribly worry about.

By f/2.8 vignetting decreases to 35% (−1.23 EV), and by f/4.0 to 19% (−0.61 EV). Further stopping down of the aperture influences weakly the aberration, described in this chapter, because by f/5.6 and f/8.0 we got the following values: 18% (−0.58 EV) and 17% (−0.55 EV).

Sony A7R II, JPEG, f/2.0
Carl Zeiss Batis 40 mm f/2 CF  - Vignetting
Below we present averaged out values of brightness loss shown in concentric circles as you move further away from the frame centre. The numerical value for every image, expressed in percents, shows the area limited from the top and right by 100% and from the bottom by the presented curve. The area indicates how much light overall is lost due to the vignetting effect. Please don’t mix these percentages with the values given at the beginning of the chapter because they aren’t directly connected.

Carl Zeiss Batis 40 mm f/2 CF  - Vignetting

f/2 f/2.8 f/4