Leica 50mm f/2 APO-Summicron-M ASPH Aperture Series: Bleached Bristlecone Logs at Blue Dusk
In Guide to Leica:
Aperture Series 50/2 APO: Bleached Bristlecone Logs at Blue Dusk(M240)
This series shows the 50/2 APO under very difficult high mountain twilight lighting (very blue), on subject matter chosen to reveal any color correction weakness.

LEICA M (Typ 240) + Apo-Summicron-M 1:2/50 ASPH
[low-res image for bot]