Can you see Gabriela? (in Mapped Colour)

[Striker (Tony)]

Haha...I just saw gabriela......once you know what your looking at you can't miss it.

Not much of a chin though...lol

[vespine]

That's simply stunning..

[ving (David)]

36 hours in one night?


thats a stunner

[tornado33]

Fantastic shot. How long were the subexposures?. Do you find fewer very long subexposures, or shorter but more of them is best?
I see that SBIG camera is a self guided one. If so does the guiding chip have to "look through" the narrowband filters or can it see unfitered starlight?
Thanks.
Scott

[Brad Moore]

Originally Posted by tornado33

Fantastic shot. How long were the subexposures?. Do you find fewer very long subexposures, or shorter but more of them is best?
I see that SBIG camera is a self guided one. If so does the guiding chip have to "look through" the narrowband filters or can it see unfitered starlight?
Thanks.
Scott

Hi Scott,

Thanks!

I have 1 hour subs for narrowband exposure.

Your shortest sub exposure should be set to a time that overcomes your cameras readout noise. For my setup it's about 45-50min with a narrowband filter, about 3mins for clear and 5mins for RGB. The darker your skies are the longer it takes to overcome readout noise.

You don't gain alot from longer sub exposure once you overcome readout noise.

http://www.starizona.com/ccd/advtheoryexp.htm

http://www.ccdware.com/resources/subexposure.cfm

Yes, the guider CCD is filtered also; I use 7 sec guided exposures.

Hope this helps,
Brad Moore