Quote:
Originally Posted by Saturnine
The 63mm Secondary that I mentioned previously is the correct size for your primary mirror . Whether the mirror is an Skywatcher of 1200mm f/l or the GSO 1250mm f/l shouldn't matter, the 63mm secondary suits both, unless your tube is oversized for some strange reason.
If you could post some photos of the tube and mirrors and their coating condition it would help. Removing the old secondary from the holder can be a problem as they are usually held on by a silicon glue which is tenacious stuff.
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It may b a home made holder, from white Poly pipe. The mirror, 95 X 67mm was fitted in with a bunch of tissue paper holding it down, so mirror could not move -- was full of ants
. Poly Pipe was painted black, but not on inside. Holder has a centre adjustment screw, plus has other adjustment from memory. Still trying to work out how to find address of my pictures on my "FORBIDDEN FRUIT" COMPUTER -- Apple light book Air. Have joined the Men's shed as I need to make a Dobson base for it. We have a computer room with a retired Apple Technician, who is going to fix the white line down my screen -- contacts, so I will ask him for help in posting pictures, which I have not bn able to work out.