The ExpoDisc (77mm) brand_Toyo used briefly before Exxon’s lawyers

used briefly before Exxon’s lawyers got involved

Interior dimensions are approximately 16x24x32cm

Canon's EF 85mm 1

with case

which does not appear to affect imaging- test images look like other Summitars we've tried- but will be apparent to visual inspection with a bright light

The ExpoDisc (77mm) brand_Toyo used briefly before Exxon’s lawyersThe 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