35mm M Glass On GFX Medium Format (1 of 2): Voigtländer 28mm f/2.0 Ultron Vintage Aspherical VM Lens Type I. I have written about this lens as used as originally intended… ..35mm, full frame format on a Leica rangefinder. Short version I really liked it. Looked good while it was at it. After a recent … Continue reading 35mm M Glass On GFX Medium Format (1 of 2): Voigtländer 28mm f/2.0 Ultron Vintage Aspherical VM Lens Type I.