The Summilux ASPH is not, from a technical perspective, the best lens I have ever used (that honour belongs to the Olympus Zuiko Digital SHG zoom lenses for the four thirds system), but it is most certainly the most capable and exquisite 50mm f/1.4 ever made, and the slow-film user's dream. These were all taken (either with Ilford Pan F or Fomapan 100) on a Leica M3:
I can confirm that, at f/1.4, the resolution and freedom from optical aberration is at least as good as the best other fast 50mm lenses (Canon 50mm f/1.2L, OM Zuiko 50mm f/1.4 [>1.1m s/n], Nikkor-H.C 50mm f/2.0) stopped down to f/4. I also really can't tell the difference in performance between this lens, and the superlative Voigtländer Heliar 50mm f/3.5 lens - quite an achievement for a fast 50!
Brand new in chromed brass, this is a thing of beauty - a real treat to all the senses. The darkroom printer's dream (as far as 35mm film is concerned), for sure.
Note: This lens is utterly flare-free. The flare around the out-of-focus branches in the first image is caused by Fomapan's notoriously poor anti-halation backing. On Ilford Pan F, image quality rivals Medium format shot with a fine-grained ISO400 film. The film is the limitation at f/1.4, not the lens.
Ilford Delta 400 has never been my favourite 400-speed film, but this image does show impressive ability to render the subtlest shadow detail (dark theatre) with a bright spotlight shining right into the lens:
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