Surplus shed 114mm f/8 mirrors
Posted 26 June 2013 - 01:54 PM
For $25 what is so wrong here?
Posted 26 June 2013 - 03:46 PM
So they may be good candidates for budding mirror makers to refigure.
Posted 26 June 2013 - 09:39 PM
But gosh, you are correct in a means to teaching the ways of polishing and reconfiguring!
Posted 27 June 2013 - 03:34 PM
Posted 27 June 2013 - 03:37 PM
Posted 04 July 2013 - 07:38 PM
Posted 04 July 2013 - 08:30 PM
And if you found the mirror was NOT up to a nice handheld scope, make a pitch lap and take a swing at correcting it. The Aluminum coating is so thin it would be gone after a few minutes of polishing.
EDIT: I see by other posts you've done a mirror or two but considering this Surplus Shack mirror as a quick start to a nice little scope still stands.
Posted 06 July 2013 - 06:52 AM
If it's smooth, and already coated (saves $), it could make a nice one. I like f/8-f/12 in this size. Moon and planets are reasonably satisfying for most casual users.
I'm not much interested in going thru the motions of making a small mirror unless it was a schief or other special type.
If it's spherical, but a good one, a simple center pull flex cell would take care of the borderline correction. Might be good as-is..dunno. Maybe return any that are poor.
I have an edmund 4-1/4 f/11 that is my grab & go. It was way undercorrected, but I've got it well corrected and smooth now, with very small diagonal, and Mars' polar cap and Cassini are easy.
Just want my friends to have one too.
Posted 06 July 2013 - 03:51 PM
Are the mirrors Pyrex?