Re: ATM Mirror questions...

["James W. Burrows" <burrjaw@halcyon.com>]

On Mon, 5 May 1997 SWDUNCAN@qtiworld.com wrote:

> One other question: From the Edmund catalog I see that the 4.25" f/10
> they sell is spherical, not parabolic. If I decide to grind my own
> mirror (not likely, but...) would that mean less work? Would it be worth
> the effort to parabolize a 4.5" f/10 mirror? 

Can be shown that the P-V deviation of a 4.5" f/10 sphere from the closest
parabola is 25 nm, 1/22 wave; probably any fiddling would make it worse.

     -- Jim Burrows:     (206)244-2933, fax -0294
     -- E-mail:     burrjaw@halcyon.com
     -- Seattle:    WGS84 lat 0.828547, long -2.135692 (rad)