This 3-way shootout at 90mm looks at bokeh in particular, but as it turns out, it is an excellent and unequivocal argument in favor of one of the lenses on multiple counts.
- Leica 90mm f/2 APO-Summicron-R ASPH (same optical formula as 90/2 APO-Summicron-M ASPH
- Leica 90mm f/4 Macro-Elmar-M
- Leica 24-90mm f/2.8-4 Vario-Elmarit-SL ASPH at 90mm zoom
The range of apertures through f/11 gives a look at how each lens “cleans up” while the 90mm f/2 APO-Summicron-R ASPH offers additional perspective at f/2 and f/2.8 as well as an excellent look at f/4 versus what the other two lenses can deliver wide open.
Includes large crops with commentary as well as full-resolution 24-megapixel images for all apertures through f/11. The f/2 and f/2.8 and apertures of the 90/2 APO provide additional perspective, since the other two lenses are f/4.
Having shot all three lenses in the field on other subjects with results that confirm the findings here, I am deem this shootout definitive. A must read for the 90mm Leica M or Leica SL shooter.