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Flare is the major weakness with this lens, as can be seen in the sample shots below, done at f/2 and f/8. Even slightest trace of light near or within the image frame, causes major amounts of flare and color shifting. If you ever plan on using the lens in bright environments with the light hitting the lens directly, you absolutely must invest in a lens hood. But while hood would help minimize the amount of stray light hitting the lens, it is not going to be a universal solution - expect some artifacts regardless.


ISO 160, 1/5000, f/2, 50mm

ISO 160, 1/1000, f/8, 50mm




The lens produced moderate levels of vignetting on M8 - at the widest aperture, vignetting is ~1.5EV, then slowly drops as you stop down the lens, practically disappearing around f/4.


In practical terms, you will see some darkening in the corners of a frame at f/2 and to a lesser degree at f/2.8 when shooting light colored scenery. Falloff can be easily corrected in post-processing - if you're using Photoshop, set Vignetting Amount in the Lens Correction option to +25 to compensate. Alternatively, you can use Cornerfix, which will do that for you automatically, assuming you've previously created appropriate lens profile.


Vignetting @ f/2 (Leica M8)



Leica Summicron 50mm f/2 Rigid showed negligible amount of distortion on M8. The lens registered ~0.5% barrel distortion with Imatest, which for all practical reasons would not affect you in real life situations.