Yashica ML Zoom 100-300 mm f/ 5.6 Lens

Build quality; no zoom creep, all metal body and mount.  Slightly lighter than the Zeiss 100-300.

Weaknesses:

F5.6 is a bit slow for 100-200 mm though it matches the ML 300 C maximum aperture.  It is quite heavy and long, though not when compared to the Zeiss 300mm f4.

Comments:

This is another of the Yashica ML gems and is almost as sharp as the Zeiss 100-300mm f4.5-5.6.  Interestingly, the Yashica has more glass (13/10 vs 12/7) but is lighter, though the Zeiss uses three ULD elements and I doubt that the Yashica has any.  Despite the extra elements, chroma issues are not a problem for the ML 100-300, even when used with modern digital cameras.  They are not very common and are definitely worth acquiring.