[Pinwheel (Doug)]

When I had my 8" f4 newt I could fit my DSLR straight on & shoot. Now, I upsized to a 12" F5 dob and as some of you know I have no Prime focus with this model (BT302-b). So with advise from an IIS member the solution is to either shorten the tube by 50mm or raise the Primary mirror by 50mm. I decided not to cut and came up with a cheap solution to raise the mirror.

I went down to the local Cabinet maker and had him cut me two perfectly round 300mm diameter x 25mm disks of chipboard for $5 each. While he did that I went to the bolt shop & bought 6x 85mm matching thread bolts also $5.00. So I have my $15 Primary adapter. All assembled perfectly, re did the colmination & I tested it all out on a road sign 3 km away. See Pic.

It works, I have Prime focus with the DSLR however NOW I've lost all Eye Piece focus completely! I can't use the reflector for eyeball viewing unless restored to original.