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Nokton showed pretty decent handling of flare, even wide open and even without the lens hood. The two shots below demonstrate what you might expect from the lens in real life situation with the lens pointed towards the sun. The shot made with wide open aperture shows some color casts as well as slightly reduced overall contrast - not bad considering many other lenses show a much more pronounced artifacts in such situations. And f/8 shot shows almost no visible impact from flare.





As one would expect from a fast f/1.4, Nokton 35/1.4 does show noticeable vignetting. On Leica M8, light falloff reached ~1.6EV at f/1.4, dropping to ~1.2EV at f/2 and to ~0.75EV at f/2.8. Technically speaking, vignetting is moderately high here, meaning that you should expect some darkening around corners as can be seen below.


In practical terms, this means that you would need to correct light falloff somehow - either directly in the camera, or during post-processing. If you are using Adobe Photoshop, you can set Vignetting Amount in the Lens Correction dialog to +18 to correct vignetting at f/1.4. The shots below showcase the amount of light falloff you should expect from Nokton if you use it without any correction.




Nokton 35/1.4 shows moderate amount of barrel distortion - at ~1%, barrel distortion would be visible in real life situations, particularly around edges. Still, the effect is subtle and probably would not cause too much distraction in my opinion.