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Home > Classifieds > Astromart Classifieds > Telescope Making > Classified #285303

For Sale: 12.5 inch flat/16 inch blank/8 inch f20/6inch f8

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Clock wise from the upper left:

12.5 inch 2 inch thick pyrex flat. Back fully polished.
Wedge .001 inch. Flat is flat to 1/16 wave or better
over 11.5 iches diameter. Edge slightly turned down.
Provides an excellent diffraction image when tested
with an long focus 8 inch test sphere at a 70 degree
angle and double pass. A picture of the flat using a
shearing interferometer is displayed below the flat.
Since it is double pass the fringe spacing is 1/4 wave
and since the deviations are less than 1/4 of spacing
this indicates a surface accuracy better than 1/16 wave.
$400 plus shipping ***SOLD

Very nice 16 inch by 1 inch thick blank from D Cassaro.
curve generated to f3.4. Substrate is plate glass but is very well annealed. Includes professionaly made
Couder mask and shipping crate. $200 plus shipping

8 inch f20 sphere. Beral coated. Nice figure. Surface
better than 1/16 wave. $100 ***SOLD

6 inch f8 and 1.1 inch eliptical diagonal. Purchased
from Orion 2 months ago but bubble wrap never opened.
$75 plus shipping ***SOLD


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