On a hunch, Jack Wolfe, a retired optical designer for the U.S. Army arranged three mirrors so that the light path was folded back to the secondary for a second pass. His doubly amplified system proved successful. It yields excellent scale for the moon and planets, and the large focal ratio minimizes eyepiece aberrations. Jack is happy to announce his designs to the amateur community.
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| Jack's prototype 6-inch doubly amplified telescope. Note the compactness for a system of such long focus. |
| Primary (sphere) | 4.25" |
| Radius of curvature | 127.5" |
| Tilt | 3°.86 |
| Distance to secondary | 28.33" |
| Secondary (convex) | 3.6" |
| Radii of curvature | 127.5" |
| Tilt | 6°.90 |
| Distance to tertiary | 28.33" |
| Distance to diagonal | 26" |
| Tertiary (flat) | 1.8" |
| Diagonal minor-axis | 1.3" |
| Image plane tilt | 6°.77 |
Curator: Hartmut Frommert
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