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Flare Resistance
Based on my experience testing various 50mm f/2 M-lenses over the years, it's clear that many Leica M lenses are not known for their flare resistance. While I haven't yet tested the Leica 50/2 APO, the Summicron and Summilux series, including the latest models, tend to produce noticeable veiling flare.
In contrast, Cosina prioritizes flare resistance, especially with their multi-coated lenses like the CV 50/2.2 Color-Skopar. This lens is indeed flare-resistant, particularly compared to other M lenses. After taking numerous sample shots in various lighting conditions, including backlighting, I found it challenging to produce significant veiling flare unless pushing the lens to its limits. The included hood is relatively small and seems less effective, but I only encountered ghosting in two instances when it wasn't used.
In the following comparison, we'll assess the flare resistance of the Voigtlander 50mm f/2.2 Color-Skopar versus the Leica 50mm f/2 Summicron. The sun was still low at 9 a.m. in California. I wasn't able to induce any ghosting or veiling flare with the Cosina lens, except in instances where I removed the hood and deliberately tried to create flare. Stopping down the lens removes the ghosting flare completely.
ILCE-7RM2 Voigtlander 50mm f/2.2 Color Skopar lens 50mm 1/250s 100 ISO 0.0 EV
ILCE-7RM2 Leica Summilux-M 1:1.4/50 lens 50mm 1/1000s 100 ISO 0.0 EV
ILCE-7RM2 ---- lens 1/1250s 100 ISO 0.0 EV
ILCE-7RM2 Leica Summilux-M 1:1.4/50 lens 50mm 1/4000s 100 ISO 0.0 EV
ILCE-7RM2 Voigtlander 50mm f/2.2 Color Skopar lens 50mm 1/800s 100 ISO 0.0 EV
ILCE-7RM2 Leica Summilux-M 1:1.4/50 lens 50mm 1/2500s 100 ISO 0.0 EV
Flare with the CV 50/2.2. It occurred without the lens hood
ILCE-7RM2 Voigtlander 50mm f/2.2 Color Skopar lens 50mm 1/320s 100 ISO 0.0 EV
Flare with the CV 50/2.2. It occurred without the lens hood
ILCE-7RM2 Voigtlander 50mm f/2.2 Color Skopar lens 50mm 1/1250s 100 ISO 0.0 EV
Flare with the CV 50/2.2. It occurred without the lens hood
LEICA M10-R f/2.8 1/750s 100 ISO 0.0 EV