Old school Yashica DSB lens. As shown from the image right above this, the front shows a nice large piece of glass. To be honestly, its not super sharp wide open and definitely not a contender against some of the highly sought after ones like canon 135F2L, Nikon AIS 135F2, or even the carl zeiss 135F2, but its still a nice piece of history, and gives very decently performance. Stopped down to F4, you can expect good sharpness. The lens remains pretty small and light despite the F2.8 aperture. For several weeks i had it mounted through adaptor and took a good few shots. On the 2X crop sensor its equivalent to 270F2.8.

Images taken with lens:

Adaptor not included. Add $38 more for a CY to EOS adaptor.