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Rob,
I highly recommend the hyperstar. The obstruction by area of the QHY8 is ~25% so its not a big penalty.
I am using a C8 hyperstar with a QHY9 which has slightly more obstruction again but I'm very impressed. Attached is a single unguided 60 second exposure of the horsehead nebula.
Pros - Inexpensive, very fast, excellent edge-edge sharpness. Fantastic value for money.
Cons - Bright stars cast funky reflections. Also some might not like the diffraction spike caused by the cabling.
Terry
Last edited by CometGuy; 28-11-2009 at 06:26 AM.
Reason: Horsehead Unspun - must have been late when I posted!
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