Have you had any experience using the compact 28mm Ricoh optical viewfinder made for use with the GR, on a Leica M with a 28mm lens? - does it do well in terms of parallax - I don’t know if the optics are optimized for the hot-shoe-to-lens distance of the GR and would introduce a bit more misalignment on the M, versus using a Leica 28mm finder. Price difference is significant enough that I am considering this Ricoh alternative. Thanks.