Tuesday, 5 January 2021 | Andrew
Quite pleased with the mask. It definitely gives a nice, clear diffraction pattern that enables quick, and precise focussing. The silicon-sleeved, adjustable screws grip the lens, or scope very nicely, with no danger of slipping if adjusted correctly. The mask arrived very well packaged, and seems to be a very nice piece of kit. I canít give it five stars though, as it is incredibly expensive for a sliver of PVC, no matter what grade of PVC it is.