LensTip.com

Lens review

Panasonic Leica DG Summilux 12 mm f/1.4 ASPH

11 July 2017
Arkadiusz Olech

7. Coma, astigmatism and bokeh

Because of differences in sharpness between the left and the right side of the frame we decided to check the coma level also for two opposite corners. As the crops below show, that decision was right. The coma in the upper left-hand corner is barely visible and it would be difficult to have any reservations here. In the upper right-hand corner the situation is quite different, with the coma being very distinct. What’s more, its level doesn’t decrease on stopping down the lens to f/2.0.

Such a situation shouldn’t have happened even in a case of a cheap lens; here you deal with an expensive instrument with the word “Leica” in the name, suggesting a top-of-the-range, high quality design and rigid quality control standards.

Center, f/1.4 Left corner, f/1.4 Right corner, f/1.4
Panasonic Leica DG Summilux 12 mm f/1.4 ASPH - Coma, astigmatism and bokeh Panasonic Leica DG Summilux 12 mm f/1.4 ASPH - Coma, astigmatism and bokeh Panasonic Leica DG Summilux 12 mm f/1.4 ASPH - Coma, astigmatism and bokeh
Center, f/2.0 Left corner, f/2.0 Right corner, f/2.0
Panasonic Leica DG Summilux 12 mm f/1.4 ASPH - Coma, astigmatism and bokeh Panasonic Leica DG Summilux 12 mm f/1.4 ASPH - Coma, astigmatism and bokeh Panasonic Leica DG Summilux 12 mm f/1.4 ASPH - Coma, astigmatism and bokeh


Please Support Us

The coronavirus crisis has been adversely affecting many businesses and, sad but true, ours is not an exception. Despite that difficult situation we would like to preserve continuity and high quality of publications available on all our websites. Still, we are now aware it might be impossible without additional financial help. That's why we would like to ask all those who visit, read, and care about Optyczne.pl, LensTip.com i Allbinos.com for support - it's enough you send us a small sum of money via PayPal. If a lot people decide to support our websites we think we'll stand a chance and survive next months without any lasting harm. We count on your support and understanding, stay safe and be healthy.

- - - - - - - - - - - - - - - - - advertisement - - - - - - - - - - - - - - - - -

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted here to 10.3%. It is a medium level but it can increase due to differences in sharpness between both sides of the frame.

Circles of light in out-of-focus areas seem to look sensible but, for such a fast lens aperture-wise they could have looked even better. There is a rim and a characteristic doughnut in the centre of the circle. In a good quality prime the light spread should be perfectly even and smooth.

E-M5 II, 25 mm, f/1.4, center E-M5 II, 25 mm, f/1.4, corner
Panasonic Leica DG Summilux 12 mm f/1.4 ASPH - Coma, astigmatism and bokeh Panasonic Leica DG Summilux 12 mm f/1.4 ASPH - Coma, astigmatism and bokeh
E-M5 II, 25 mm, f/2.0, center E-M5 II, 25 mm, f/2.0, corner
Panasonic Leica DG Summilux 12 mm f/1.4 ASPH - Coma, astigmatism and bokeh Panasonic Leica DG Summilux 12 mm f/1.4 ASPH - Coma, astigmatism and bokeh
E-M5 II, 25 mm, f/2.8, center E-M5 II, 25 mm, f/2.8, corner
Panasonic Leica DG Summilux 12 mm f/1.4 ASPH - Coma, astigmatism and bokeh Panasonic Leica DG Summilux 12 mm f/1.4 ASPH - Coma, astigmatism and bokeh