Yashica was never a 'major' like Kodak, Pentax, Leica, Nikon, Hassy, Minolta, but it was never an 'off-brand' either. As mentioned, many of their TLR and RF cameras were great favorites. I miss my Yashicamat 124G; I won't give up my GSN Electro 35. Many of their SLR lenses are superb and highly desired; some lines, like the DSB (in C/Y mount) are competent but not glorious. Two of my fave Fifties are the planar ML 50/1.4 (C/Y) and the DX 50/1.7 (M42).
I have modded some C/Y lenses. It's very easy, about the same as modding Olympus OM mounts. The problem: the lens bayonet blades are a little thicker than the space under the camera mount lugs. The solution: use a Dremel metal-cutting blade to shave the lens bayonet blades slightly. It takes about 5 minutes per lens, including setup and cleanup.
I do NOT recommend modding expensive Contax-Zeiss C/Y lenses, not unless you KNOW you'll never sell it. Leitax has a C/Y-->PK kit -- not cheap, but worthwhile for a costly lens. But I have no qualms with Yashica C/Y lenses. I just wish they were more affordable -- word has gotten about about their quality. Oh bother.
Last edited by RioRico; 06-13-2012 at 11:39 PM.