Opinions of the 21mm Super-Angulon
I love my 3.4/21mm Super-Angulon very much.
I use it mainly for black & white street shooting on meterless M's.
The fact that it is a retrofocus design ensures that it's distortion is minimal. I find it much better on this subject than my modern Canon zoom lenses (including serie L). I mention it just to give you a relation to actual models you may find on the street everyday.
I also love it's compact size and good build quality.
Now about vignetting: EVERY (extreme) wide-angle produces vignetting! That's physics!
I don't shoot Architecture with 35mm. I use some other (specialized) equipment for that: Corfield WA 67 and Horseman SW 612 Pro (the one with shift capability), from 6x7 to 6x12. Both use either a Super-Angulon from Schneider, or (APO) Grandagon from Rodenstock. You can bet that I (always) use the so called Center-Filter made for these optics.
As well as I use center-filters in any wide-angle lens from Schneider or Rodenstock that I use on my large-format cameras.
These filters are really expensive...
Why I use them? Because ALL of these lenses suffer from vignetting and I am a perfectionist!
Surelly they are NOT bad lenses: as a matter of fact, together with the Zeiss Biogon, I consider them to be the best wide-angles you can get!
A wall made of bricks keeps looking like a wall made of bricks! No need for PP programs...
I think the "problem" is that in 35mm the manufacturers didn't bother to make center-filters for their optics, as the purppose of the lenses is not Professional Architectural Photography or some other highly technical stuff.
Street photography and similar types maybe don't need that kind of perfectionist correction, or so they seem to think...
As a matter of fact, when I print (traditional) BW on the wet darkroom, I very often darken a bit the corners of the prints, for them to get some more plasticity. With the Leitz Super-Angulon maybe I need to do it a little less...
BTW: I also use a "newer" Elmarit-M (Tabed, 28 engraving), and I can't say that I prefer it to the S-A 21mm. Maybe a little better technically, but I think it lacks some "character".
It depends on what I wish to do when I photograph. For the kind of work I do with Leicas, I find the 21mm S-A just great! (The same I cannot say about some Nikkors I had, for example).
If I would buy new today, I would seriously consider the Biogon 4.5/21mm. Surelly high performance for a realistic price.
It also has one of the main caracteristics I like in the S-A: compactness.
Greetings,
Rui