Fred Miranda wrote:
At f/11, the lens performs similarly on both the Leica M and when adapted to Sony. This lens shows some curvature in the far corners, so if you focus on the center or mid-field, the corners do not reach optimal sharpness until f/11. However, if you focus directly on the corners, they appear sharper at apertures wider than f/11.
If anyone is looking for an ultra-thin UV filter for their Voigtlander 40mm f/2.8 Heliar, the one I bought in Japan is now available on eBay: https://www.ebay.com/itm/317034474950
Today Cosina announced that they have discontinued production of 40/2.8 VM, both Black & Silver versions, so now there are no versions of this lens remaining in production.
