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As briefly eluded to in the earlier section, Summarit 50/1.5 does not deal with flare particularly well. While Summarit did receive coating from the get-go, it does not seem particularly effective in reducing flare. A single coated lens is still better than uncoated lens, but seems only marginally (plus we need to take into consideration the 50+ years of abuse that the coating might have endured during the regular use of the lens) - the lens would flare no matter what when shot directly into the sun, as can be seen in the shots below. Both at wide as well as small apertures, the lens shows color casting, glare and minor ghosting, all of which should convince you to invest in an after-market hood. Alternatively, just don't shoot into the sun and you should be fine.


Summarit showed some noticeable vignetting at f/1.5, reaching ~1.6EV on an APS-H camera. Light falloff at these levels will be visible around corners, but unless you're photographing lighter colored scenery, should not be a big issue IMO. Vignetting drops even further as you stop down the aperture - at f/2 it is ~0.9EV and at f/2.8 it is ~0.5EV and which point it becomes completely harmless.

Leica M8 (10Mp)

If you find yourself in situation when you need to correct for vignetting, you can try doing so either by coding your lens, or if you own M9, selecting the option in the camera's menu (Summilux Pre-ASPH 50/1.4 should work, although I personally have not tried this option), or simply using an app like Photoshop to fix falloff in your post-processing work-flow. Setting Photoshop's Vignetting correction to +25 seems to remove all traces of vignetting at f/1.5


Summarit 50/1.5 showed negligible amount of barrel distortion - at ~0.1%, this can be considered to be a noise.