Venus Optics LAOWA 9 mm f/5.6 FF RL review - Coma, astigmatism and bokeh

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Venus Optics LAOWA 9 mm f/5.6 FF RL

13 August 2020

Maciej Latałło

7. Coma, astigmatism and bokeh

Crops presented below show clearly that coma is corrected very nicely in an area covering the APS-C sensor. When you pass to corners of full frame you can notice deformations of point-like diode images without any difficulties but still you can't describe them as big. Overall, we have no serious reservations concerning coma correction.

Center, f/5.6	Corner APS-C, f/5.6	Corner FF, f/5.6

Center, f/8.0	Corner APS-C, f/8.0	Corner FF, f/8.0

Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to as much as 20.8% and it contributes significantly to worsening of images, being a more serious factor than coma.

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In case of 5.6/9 parameters it would be difficult to speak about distinct blurry areas; still due to a very small minimum focusing distance we managed to get defocused circles of light of sensible size. Looking at them we can say that there are neither sensational results nor very big problems in this area. Of course, from such a lens, nobody would expect any miracles in this category...