LensTip.com

Lens review

Pentax smc FA 31 mm f/1.8 AL

14 October 2011
Arkadiusz Olech

8. Vignetting

One glance at the thumbnails below shows that vignetting on the APS-C sensor is not a serious problem any more.

Pentax smc FA 31 mm f/1.8 AL - Vignetting


The chart below shows that the Pentax fully uses its advantage, stemming from the fact that its image circle is adapted to full frame. The vignetting at every aperture value is lower than that of its competitors. The tested lens wins even with the faster Sigma.


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Pentax
1.8/31
Sony
DT 1.8/35
Nikkor
1.8/35
Sigma
1.4/30
Pentax
2.4/35
f/1.8
27%
44%
37%
31%

f/2.0
24%
39%
31%
28%

f/2.8
10%
14%
22%
22%
25%


Pentax smc FA 31 mm f/1.8 AL - Vignetting