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Astro-Physics 6" f/12 Super Planetary "Post NASA Glass"

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This is a continuation of the sale of my scope collection.

This scope gave me a greater level of respect for the early A-P scopes. Views are just amazing. While the size of these scopes require a stable mount they are relatively light and easy to handle for there length. This scope was serviced by A-P a few years ago and the cell rebuilt. The condition of the cell is excellent while the tube is good but has some ring marks in the paint. 

I believe I have some rings that will fit this scope and will include them if I can find them in the hell I call "storage"...

I have attached below a segment of the write up which Thomas Back did called "A Brief History of Astro-Physics Lenses" which pertains to this scope. The entire article can be found on the web and is worth a read by anyone interested in A-P Scopes. 

Produced in 1986 through 1987 this scope still provides great planetary and deep field viewing. 

Article:

The August 1986 issue of Sky and Telescope might have been the most impressive ad for its time. Seven apochromatic refractors were listed, and the most impressive was the 6" f/12 Super Planetary for $1540. The ad read: "Our new long focus refractors are designed for the most discriminating Lunar/Planetary observer who does not want any compromise in performance... The Lunar limb and the disks of the planets are sharply outlined against black sky, resembling charcoal drawings." Well, I can tell you that got my interest! I placed an order for one, and at the next AstroFest Telescope Convention, I viewed Jupiter with a 6"f/12 Super Planetary with the one and only Robert Cox, and we were both staggered with the amount of planetary detail. Robert's own words: "The planet presented a clear, sharp edge with a high contrast view of the surface features." I might add that at this same AstroFest, Roland and Marj brought a custom 8" f/14 triplet, which was giving views of Jupiter at 300x that reminded everyone of the Voyager pictures (just ask Marj), as around 11:00 PM the first night, the seeing was near perfect. The other scopes in the line were a 4"f/6 ($895); 5"f/6 ($1195); 4"f/10 ($895); 5"F/8 ($1195); 6"F/8 ($1440), and the 5" F/12 ($1225). This last scope was Terence Dickinson's first AP purchase and was so impressed with. Roland was also taking orders for larger, custom lenses. A 8" was purchased by Sue and Alan French, and they took this scope to many star parties. All these scopes were based on a similar design, crown glass (BK-7 or BaK-1), abnormal dispersion flint (KzFS-1 or KzFSN-4) and Barium flints (BaF-10, BaFN-10). To learn more about this type of apochromatic lens design, see Telescope Making issue 28, page 20. A little known fact about the early 6" f/12 Super Planetary scopes is that they also used the "NASA" glass. The later models (I presume the NASA flint glass ran out) used K-7 crown and KzFSN-4 flint glass.