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Old 12-01-2010, 03:14 PM
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alistairsam
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Thanks for that. Am just deciding on the DSLR.

Could you'll please elaborate a bit on field flattening. I'm guessing this is to reduce field curvature. how is this done.

Had a look at the Baader MPCC and Paracorr. Will have to get one of these.

Came across explanations on how colour sensitive cones in our retina are limited and therefore we see less colour through the eye than through a camera.
This would mean that to view nebulae and discern colours, we have to use a camera.

Threfore, does normal viewing without a camera through a large aperture reflector, say 12" and above, provide satisfactory viewing?

Would'nt it be pretty much like viewing in black and white, add to it the need for long exposures to get details of galaxies and nebula, can we really see galaxies with just good eyepieces and 8" and above reflectors?

What objects are best viewed through a large aperture F5 or F6 reflector without cameras. I mean with 12" and above primaries.

I might have to move this question to a different thread, but are equatorial platforms sufficient for exposures of say 15 to 20 minutes for deep sky objects?

Does dark frame subtraction make much difference if using a DSLR?

Sorry about the series of questions, just that its so fascinating and broad.
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