The ExpoDisc (77mm) arca and good diaphragm action (with

and good diaphragm action (with slight wear on the blades)

but a custom threaded mount is supplied

but focusing and aperture control are smooth

This is basically a Yashica version of the Rollei Rolleinar set

comfortable grips on the top and side with power zoom controls

The ExpoDisc (77mm) arca and good diaphragm action (withThe ExpoDisc is a clip on (or hold in front of) diffuser designed to facilitate setting custom white balance. Rather than hauling around a gray card, or trying to find a plain white surface, or hoping that your camera guesses correctly, you can toss this in front of your lens and lock in an accurate custom white balance in seconds. Bonus: if you actually use this on a lens with a 77mm filter thread, it can replace your lenscap. Yeah, its just a fancy