The spot diagrams to the right show the 3" coma
corrector's performance on a 16" f3.5 Newtonian . |
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Even at the extreme corners of a 24mm x 36mm CCD chip,
the RMS spot radius is 3.3 microns. An amazingly small area at
this field location, 22.2mm off-axis. A Ritchey-Chretien Cassegrain
at the same location on this size CCD chip is roughly 24.6 microns,
more than 7.5 times larger in size. |
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