Are you looking for a blank for a "grind it yourself project"?
I have a sizable number of quality blanks available from 4 1/4" to 30" diameter. Lets know what size blank required. I will give you the options in glass type and thickness, (and prices [in NZD]).
Photos" 4 1/4" Pyrex blank, Ronchi image of an 18" f3.3 1/30 Lambda 0.995 Strehl mirror made from one of the plate glass blanks, completed 25" f5.3 mirror.
Can supply you with grit and cerium oxide at a reasonable price.
Happy to ship NZ and Australia, (other places also). Purchaser pays shipping.
Also have a number of finished and semi-finished mirrors, in various sizes, thicknesses, plate glass, pyrex, etc. From NZ$35 (3"f6 with 22mm secondary [aluminized set]). Others inquire.
See pictures below. From left to right: 1) Aluminized 3"f6 sitting at base of uncoated 33"f4.1 mirror. 2) 7" f7.5 (polished-could use more figuring-uncoated-plate glass). 3) 8" f8 1/8 wave Pyrex uncoated with mirror cell.
4) 6" aluminized optical flat. 5) 25"f4.68 (silvered [getting a bit tarnished after 15 months]).
Have several other examples as well. Give your size preference, and I will give the available options.
Make good projects. Can ship NZ/OZ. Freight extra. Payment by Paypal.
This is a quality 6" 1/10 wave aluminised flat in BK7. 1" thick made by the late Gary Nankivell, (well know optician)[Google for background and experience]. Coating is excellent. Ideal as a test flat, or for folded optics Newtonian. Large flats of this quality are hard to come by.
Mirrors: 3" to 25"
