[dcnicholls]

Tested with a 60mm Unitron refractor tonight. It shows classical diffraction patterns (inside/at/outsude focus) when viewed in the dark at a distance of 48 feet (indoors). I don't have an SCT, and my 12" LB Newtonian is not easy to get into position to test indoors - will work that one out tomorrow.

So far so good, though I don't think it's bright enough to use in during the day.

Dimensions 7cm x 3cm x 2cm

See the two prototypes, below.

DN
(perhaps this thread should be moved to the DIY forum?)