The ExpoDisc (77mm) brand_Toyo Canon's EF 85mm 1

Canon's EF 85mm 1

Interior dimensions are approximately 16x24x32cm

The Sigma EX 4

there is no effect on function

with a mid spreader and removable wide-contact swivel feet for floor use (there are spikes underneath)

The ExpoDisc (77mm) brand_Toyo Canon's EF 85mm 1The 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