I am interested in answer although I don’t think it is refractive index we are talking about. As yu say one is transmission and the other reflection if I have it right. I think that in the case of the mirror the image seen in a photograph would be sharp to the edges while the image in the ball would not. But this is conjecture so maybe someone can elucidate on this item. :) andy > On Jun 7, 2019, at 3:12 PM, Randy Little <randyslittle@xxxxxxxxx> wrote: > > Does anyone have one of these photo crystal balls? I'm wondering what the refraction index is like say compared to the distortion of a mirror ball. Clearly one is a reflection and one is refraction so I get that part :-) > > Randy S. Little > http://www.rslittle.com/ > http://www.imdb.me/randylittle > >