|
how do homecast mirror blanks perform against professional ones ?
hello there... been watching a website of a guy who bakes his own mirror blanks in a small kiln, size about 8-14inch so far. he uses simple glass plates he gets from thrift stores etc. bakes them together in his kiln, he even can make honeycomb-leightweight structure.
but how does such a mirror perform against a BAK7 or pyrex mirror u get in your regular skywatcher, GSO or celestron newton ? is the expansion a big problem ? anybody got any experience ?
of course this costs him time, but moneywise when youve got the kiln those blanks can be gotten for less than 50$. then some grinding tools and lots of time+ a faucault tester and youre in the business for making your own mirrors...
cheers Mark
|