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Hi Patrick,
with such a small chip (less than 5mm off axis) an f/6 Maksutov Newtonian is certainly more than ample good enough to place almost 100% of energy within one pixel (~9 micron).
The Barlow might make that slightly worse (they will all introduce some chromatic residuals) but it will still be adequate for the purpose.
For the record, at 5mm off axis MN66 C-F spot is something like 7.6 micron RMS radius. At 3mm off axis (with a mild Barlow, that will be the field used) it is 6.4 microns RMS.
Bratislav
Last edited by bratislav; 04-01-2010 at 02:06 PM.
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