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I just threw this Bris sextant quickly together.

Its rather rough I was just testing the concept and my sloppy impatience. I used 2 pieces of beam splitter glass with a slice of the same  glass as a space. The Welding filter is stuck onto the bottom glass and lays flat, it does not have a spacer. I believe because the beam splitter glass has a mirror like surface it produce a lot of false imaging and laying the filter glass flat fixed this problem.

When I tried to space the  filter glass i got a lot of minor moons that were very difficult to align and glue. The result has beeen better than using the cheap chinese microscope slides. I just used super glue which was a mistake since it set instanly giving me no time to do an accurate alignment of the glass.

I have attached a picture of the moons with the filter glass sitting directly on the phone lense. I used # 12 glass which  is  a bit dark even for a noon overhead sun. 

I get 5 nice moons which is usable. The other moons are too dim, 4 or 5 usable  moons.

I will take more care when I find the right epoxy. 

The beam splitter glass is a lot simpler, its just a bit more tricky to cut with clunky large glass cutting tools because its so fragile.

I have attached the picture, does it the image moons look respectable enough?

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