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Old 05-04-2015, 12:24 AM
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alistairsam
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Join Date: Nov 2009
Location: Box Hill North, Vic
Posts: 1,838
Quote:
Originally Posted by alpal View Post
Hi Alistair,
looks good to me.
I think too many stars have exceeded the well depth -
they look over exposed.
Would 5 minute frames for luminance have been better with the same time?
A 10" f4 really grabs the light so it shouldn't need 15 minute exposures on such a bright target.
A 15 minute Ha frame would have been interesting though.

I can't wait to have a go on this one when my 10" f4 mirror arrives.

cheers
Allan
hi Allan,

I wanted the damn Jet, so went for 15 minutes. but also because I go by Ray's method of a target ADU for the background.
mine's around 3300 and with this 15min, its 3370 odd.
I think Ray's thread has some mention of not worrying about the well depth. can't remember.
This is the processed Lum
https://www.dropbox.com/s/ky05rj60vw...tack7.png?dl=0


Quote:
Originally Posted by NOMH View Post
Lots of nebulosity in the Alistair! Looks great and you've done well with so few exposures.

I find my stars are always a problem for me. I think my exposures are fine for the target but the stars do over saturate and grow in size. I want to try shooting 30-60 second images just for the stars and then figure out how to swap them.

JB
Thanks. I think they can be controlled when processing.

Cheers
Alistair
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