The diagram above illustrates the optical quality
at 22.211mm off-axis for both optical designs. This location
would be the extreme outer corners of a 24mm x 36mm CCD chip. |
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The Dream Astrograph's RMS radius at this location
is 3.3 microns. The R-C Cassegrain's RMS radius at the same 22.211mm
off-axis location is 24.6 microns. |
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Click on the graphic to see an enlarged version. |
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The spot diagrams were both based on 16" telescopes.
The f8.4 R-C with a f3 primary and 14" of back focus. The
Dream Astrograph with a f3.5 primary. |
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