[Please note, this version does not accept a hood cap] This hood fits to the existing bayonet attachment via a very tight friction fit. On first fitting it may feel you are forcing it, but this is normal and the mount has been tested across 3 different examples. Some prints may be very tight, but cleaning out the bayonet grooves will remedy this.
This is a very compact hood for the Zeiss ZM 50mm f2 Planar lens, as a replacement for the £70+ one that Zeiss offers. It's incredibly more compact and has been calculated to offer greater shading.
It's rectangular cutout is 10% wider than the lens' field of view for full frame and has been shown not to cause vignetting. On crop sensors such as M8 or NEX, there will also be no problems