Review on Enhanced Vision with Ajax Scientific Concave Mirror Diameter by Dan Chunn

Knowing this is a frameless mirror so has a dished base I give it five stars Quality mirror and meets my expectations. I bought this to try out as a turntable for precision gyros and found that the curvature is still a bit steep for gyros that can be prone to blasphemy, but overall it's still a versatile alternative to glass lenses and I like the look for photography . Vertices reflected in the image. The curved underside issue was easily fixed by ordering some 4" OD x 3/16" thick o-rings (https://www.amazon.com/gp/product/B000FMWOF2/ref=oh_aui_detailpage_o01_s01?ie =UTF8&psc=1). ) which work great, just high enough to give the mirror the clearance it needs to sit flat without wobbling. In the meantime, an extra o-ring can be placed on top of the mirror to hold the top, but this only works if the o-ring is glued to the mirror or enclosed in a pocket cut from foam, wood, etc. of the mirror and the O-rings.