Struggled a little bit with extracting sharpness across the frame with this lens yesterday. I wonder if its optically identical to the collapsible 5cm f3.5, which was developed originally for the Hansa Canon in the 1930s/1940s. I think George has this lens and may have been able to get more out of it.
The collapsible 5cm f3.5 lens is also not quite the same image quality as the 5cm f2 HC, just from cursory use of that lens. But then this was a very early foray into the consumer imaging business for the company.
I do have that lens Samy. Don't think I ever used it on the Z6 during the short time I had it. I have always been happy with the results with it on the Leica. Although I do like the 5cm f/2 HC better, the f/3.5 has the advantage that it is the same filter size as the 3.5cm and 2.8cm lenses. Handy when using the color filters for shooting on the Monochrom or shooting black and white film on a LTM compatible camera body.
