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Old 27-11-2009, 11:22 PM
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Octane (Humayun)
IIS Member #671

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Join Date: Dec 2005
Location: Canberra
Posts: 11,158
Terry,

That image has totally spun me out.

Regards,
Humayun

Quote:
Originally Posted by CometGuy View Post
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
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