I am selling my 6" F4 primary by Ed Beck, which is in excellent condition.
Note the gold color you see in the first photo is a reflection of an outdoor awning,
this mirror is aluminized not gold-coated.
I custom ordered the mirror to be 1/16 wave surface (1/8 wave wavefront) or better.
Ed tested it out to match that spec using his 1/16 wave flat.
I only used it a few times because I went into astrophotography
and my focuser couldn't handle the weight/torque of my camera.
The entire scope has been sealed and in a closet since then.
Note on the edge of the mirror at the 9 o'clock position you can see the 1 defect
in the coating, about 2mm long and 1/10mm wide. There is a small rub mark just
below it which is about 2mm X 4mm. Both can be covered by a mirror mount clip.
There also appears in the jpg to be a similar defect near the edge at
the 3 o'clock position, but I examined the mirror w/ an eye loupe and
grazing illumination after taking the photos, and the 3 o'clock object
is not on the mirror. The shot was taken with the door open so it may have been
a speck blown in. Other than the above, the coatings are in excellent condition.
Buyer pays shipping. Price includes PalPal fee. Price firm, no trades.
Filed under: Eyepieces & Accessories