Comments on: IOM August 2009 – reflection nebula NGC6914 in Cygnus

By: Daniel S

Daniel S — Mon, 10 Aug 2009 15:51:46 +0000

Hi Greg, thanks for the reply, Bern at Modern Astronomy shall be expecting a call soon!

Daniel
:O)

By: Greg Parker

Greg Parker — Tue, 04 Aug 2009 09:00:33 +0000

The IDAS filter really does cut out my background light pollution (mostly sodium street lights), so I have not got near my “limit” of 10% full well for the background. I think going up to 10% will probably be manageable, but I think I’m around 5% or less most of the time.
Greg

By: Daniel S

Daniel S — Mon, 03 Aug 2009 19:42:21 +0000

Hi Greg, thanks for the info, 30 minutes with the hyperstar in a relatively light poluted area sounds incredible, Wroughly what kind of background ADU do you allow before deciding an image is over saturated? Right now my BG sits around 1500-2000 ADU for a 90 second exposure on a clear night

Sorry for all the questions, im quite new to the hyperstar and though I’ve been massively impressed with the images I’ve been able to obtain, I’d love to go deeper with the images but always felt I was hitting a wall with the light polution here.

Thanks

Daniel
:O)

By: Greg Parker

Greg Parker — Sun, 02 Aug 2009 20:42:31 +0000

Hi Daniel,

I use a 2″ Hutech IDAS light pollution filter from SCS astro which seems to work pretty well even at f#2. In fact I have taken 30-minute subs with the Hyperstar (for M33) and didn’t have bad sky background problems.
Greg

By: Daniel S

Daniel S — Sun, 02 Aug 2009 11:11:33 +0000

Beautifull Image Greg, Just wondering what filters you are using with your hyperstar setup as I know you too struggle with light polution and im amazed your able to go 5 minutes, right now I seem to be limited to about 1:30 maximum before the sky background takes over, do you ever allow sky background to saturate the image and fix it within processing?

Thanks

Daniel
:O)