You asked
Is the voigtl nder nokton vintage line 35mm f 1 5 aspherical good for landscape?
It can work, but it's a middling choice for landscapes. The landscape guide points out that you'll usually be on a tripod with slow-moving scenes, so the main thing you need is a focal length that fits the view. On full frame, 35mm is a moderate wide angle: good for scenes with some foreground and context, but short of the ultra-wide range (14-24mm) that many landscape shooters want for big vistas.
The f/1.5 aperture matters less here, since you'll usually stop down for depth. Manual focus is fine when you're working slowly and can use live view. If you want a similar view for less money, the Voigtländer Ultron Vintage Line 35mm f/2 Aspherical is also a full-frame 35mm prime in the catalogue.
Written by Claude from this site's pages.