Some time ago while I was helping Edmund Scientific arrange 3 of their giant warehouses of optics at the Barrington, New Jersey retail store, I came across two other Astroscan prototypes which never seen the market, catalog or any place except for Edmund's museum. While every body knows the familiar one ball red type there were two other designs. I tried to buy these from the Edmund family but they said they were for their museum which contains every Edmund Telescope ever manufactured still in their unpacked boxes plus ones that are for display. Also, that day I didn't have a camera to picture them to relay to everyone. In this forum I will include a picture of the Famous Red one ball Astroscan and at the same time draw pictures which will show the scale of the other two Astroscan Telescope Reflectors.
The included picture shows the Edmund 1977 (original first manufactured has an early time/date) one ball design and the other two were focal ratios of F/6 and F/5. Starting with the F/6 there were 3 balls to the bottom of the telescope with each ball getting smaller in diameter and then the straight tube just like the one ball design. The F/5 design had 2 balls at the telescope's bottom with each ball getting smaller in diameter and then the familiar straight tube which held the 1.25" focuser. On all 3 telescopes, the bottom ball which rests on the aluminum base has the same large diameter. They all had the similar Edmund 4 1/4" diameter full thickness pyrex primary mirror optics and the front optical window with each particular f/ratio scope having the correct size minor axis secondary mirror and secondary support system exactly like the F/4 model. Also, these 2 Astroscan telescopes had the same die cast plastic housings and the same cast aluminum bases except the only difference was the color scheme which was Meade Blue. The drawings are almost finished and will be added shortly.