B+W 007 Clear MRC Nano Master (52mm) mamiya so it may fit those

so it may fit those too

you can toss the holder into a warm pocket and minimize the effect of extreme cold weather on the function of your battery-powered camera

but there's more to it: according to Gitzo

So tell your mom to please not pick up the phone for a half hour and dial into this website to buy the Sony GC-1 Net-Sharing Cam

B+W 007 Clear MRC Nano Master (52mm) mamiya so it may fit thoseB+W 007 Clear MRC Nano Master filter for 52mm filter threads. A high quality filter for everyday lens protection, with B+W's premium Nano coating for modern high performance lenses. Image is for illustrative purposes only. Actual item may differ.