Support Astromart! | Log In | Help
Astronomy NewsTelescope ClassifiedsTelescope AuctionsTelescope Articles & ArticlesTelescope Articles & ReviewsTelescope and Astronomy ForumsAstronomy Events Calendar
View Categories
Browse By Location
Place A New Ad
Display Preferences
Search Classifieds

User Name:


Save Login
New to Astromart?
Register an account...

Terms of Service
Privacy Policy
Help & FAQ
Astronomy Links
User Profiles
Top Users List
RSS Feeds

Home > Classifieds > Astromart Classifieds > Telescope Making > Classified #108374

For Sale: Exceptional Galaxy Optics 22" f/4.5, save $1000

Please Log In to view the details for this classified ad.
Don't have an Astromart account? Click here to create one

Galaxy Optics is at the high-end of quality for large thin
mirrors for Dobsonians. You'll find them in JMI's NGT scopes,
Obsessions, StarSplitters and others.

The mirror was made in May 1995 as SN-01462 and was figured by
John Hudek.

The optics set here consists of a 22" precision-annealed pyrex mirror, 99.1" FL, 2" thick, with 96% coatings and weighing 72lbs. It has full laser interferometry, and shows wavefont astigmatism of 1/45 wave, and spherical aberration averages 1/15 wave on the wavefront!!

The integrity of the coatings is excellent. However, there are
mini-scratches from cleaning.

The diagonal is 3.5" for a minimal 16% (!) obstruction. This very
small obstruction requires particular care in choosing and placing
your focuser. (You want the separation between the focal plane at
the outside of the fouser and the center of the diagonal mirror to be less than 13 7/8" -- this requires using a very low profile focuser, or embedding the focuser into the tube slightly, or both. --A small price for optimal contrast). Interferometry on the diagonal shows 1/11 wave P-V on the surface. It has 97% coatings.

The current cost of this set from Galaxy is $5505. Because of
illness I can no longer use the telescope containing them, so
they are available for $4000 + US shipping.

This is an outstanding price on some outstanding Newtonian optics!
:-) Contact the seller for further details.


Back to Listing

All times are in (GMT-8:00) Pacific Standard Time Zone  
Astronomy News | Telecope Classifieds | Telescope Auctions | Telescope Reviews | Telescopes | Telescope and Astronomy Forums | My Account | Help | RSS