The ExpoDisc (4x5.65") lens mount_Praktica Electronic but several other bodies including

but several other bodies including the F4 and F/N90 work as well

The Fotopro X-4i is a compact tripod with a slightly unusual design: the centre column is “permanently” extended

Two camera platforms and one stopper block are included (both sides have an end stop

with some cosmetic wear from normal use and handling

something else

The ExpoDisc (4x5.65") lens mount_Praktica Electronic but several other bodies includingThis particular Expodisc is not a disc it's a big 4x5. 65" slab designed to slip into matteboxes but it works the same as the classic. Basically, it's a specialized flat 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.