Voigtlander Apo Lanthar 28 mm f/2 Aspherical review

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Voigtlander Apo Lanthar 28 mm f/2 Aspherical

16 March 2026

Maciej Latałło

7. Coma, astigmatism and bokeh

Once again physical dimensions of the tested lens had made us a bit apprehensive when it comes to coma correction. Once again all our worries proved to be groundless. Even in the very corner of full frame point-like images of a diode don't feature any distinct deformations apart from a slight lengthening of image connected to classic coma. It is a performance way better than the performance of the Sony 2/28.

Center, f/2.0	Corner APS-C, f/2.0	Corner FF, f/2.0

Center, f/2.8	Corner APS-C, f/2.8	Corner FF, f/2.8

To make our test more comprehensive, we decided to show crops taken from photos of the night sky or, more specifically, from the right-hand upper corner of full frame. This time we show images taken at f/2.0, f/2.8, and f/4.0. This kind of test is a tad more demanding—apart from the lengthening connected to coma, you also see slight wings that are caused by higher degree aberrations. Once again, the level of these deformations never increases to high levels, so our assessment in this category remains good.

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Corner FF, f/2.0	Corner FF, f/2.8	Corner FF, f/4.0

Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 4.8%, a value considered to be on the borderline between low and very low levels, so the tested Voigtlander once again deserves to be praised.

Defocused circles of light, provided by the Apo Lanthar, look sensible enough, especially as you deal here with a wide angle lens. Its optical construction features two aspherical elements, so there is a slight onion ring bokeh effect. When it comes to mechanical vignetting, it remains clearly visible by f/2.0 and f/2.8, disappearing practically completely by f/4.0. It is a piece of good news because many big lenses feature distinct vignetting even on stopping down the aperture by 2 EV. The small Voigtlander's performance in this area deserves to be praised.

Center, f/2.0	Corner APS-C, f/2.0	Corner FF, f/2.0

Center, f/2.8	Corner APS-C, f/2.8	Corner FF, f/2.8

Center, f/4.0	Corner APS-C, f/4.0	Corner FF, f/4.0