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Lens review

Venus Optics LAOWA Argus 33 mm f/0.95 CF APO

21 September 2021
Maciej Latałło

5. Chromatic and spherical aberration

Chromatic aberration

The influence of longitudinal chromatic aberration is visible at the maximum relative aperture, even though, in the case of that aperture, the sharpness is so low that it would be difficult to spot anything. Fortunately by f/1.1 the situation improves and we mean here both, image quality and correction of longitudinal chromatic aberration. Overall we didn't notice a lot of problems and, taking into account the significant aperture fastness of the tested lens, you can forgive it even the slip-up by f/0.95.

Venus Optics LAOWA Argus 33 mm f/0.95 CF APO - Chromatic and spherical aberration

Now let's check how the lens fares when it comes to lateral chromatic aberration – an appropriate graph is shown below.

Venus Optics LAOWA Argus 33 mm f/0.95 CF APO - Chromatic and spherical aberration


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No problems whatsoever in this case. The aberration increases slightly from 0.03% near the maximum relative aperture to 0.04% on more significant stopping down but these values we still consider to be very low and, in practical terms, they should't contribute to worsening of image quality of your photos.

Nikon Z7, RAW, f/0.95 Nikon Z7, RAW, f/11.0
Venus Optics LAOWA Argus 33 mm f/0.95 CF APO - Chromatic and spherical aberration Venus Optics LAOWA Argus 33 mm f/0.95 CF APO - Chromatic and spherical aberration


Spherical aberration

In the first photos of this chapter you can notice a slight focus shift toward greater distances. Also the appearance of defocused circles of light obtained before and behind the focal point confirms the problems related to spherical aberration. In fact it's a textbook example – the frist circle features soft edges with brightness decreasing on the very end of them, the second circle has a slightly brighter rim. You also shouldn't forget a 'mist' visible in images the Argus produces by f/0.95.

With three classic symptoms of bad correction of spherical aberration it is not a surprise we can't assess the lens well in this category.

Nikon Z7, f/0.95, before Nikon Z7, f/0.95, after
Venus Optics LAOWA Argus 33 mm f/0.95 CF APO - Chromatic and spherical aberration Venus Optics LAOWA Argus 33 mm f/0.95 CF APO - Chromatic and spherical aberration