Ngc5054

[lhansen]

Last one. This I'm really not sure about. Louie had a go at it and improved it out of sight. I think a bit more data is in order though. Pretty faint and a hard one to capture (for me at least)

L 30*5mins Unbinned
RGB 10*5mins each unbinned

Taken the 24th march this year

RCOS12.5, PME, ST8XME

[TrevorW]

Longer subs too smooth out the background and enhance colour

tracking spot on and star roundness as you'd want from this set up

[gregbradley]

Yeah, good attempt but its too faint a target. Needs a 20 inch scope or something that one.

Greg.

[lhansen]

Thankyou both for those comments.

Greg - 20"? Now that sounds like a challenge to me, I certainly cant afford to buy a 20" so I'll try some 10 minute subs tonight (weather permitting) and see if I can get some more detail. I'll also do some binned*2 colour images, that may go deeper than the unbinned colour images used for this images.

Cheers and thanks

Lars

[gregbradley]

Go for it mate. I usually use 2x2 binning on RGB and 1x1 on luminance and Ha. There's arguments for and against 2x2 binning RGB.

But unless you are going for putting in the extra time on the RGB to get max detail it isn't worth it for the drop in signal. RGB does not differentiate between shades of colour as sharply as B and W does in edges and shades of grey. So 1x1 binning is a bit of a waste unless you want absolute detail and are willing to invest the extra time to get it (my opinion anyway). I'd do 1x1 RGB on a globular for example or perhaps a bright galaxy.

If you have been shooting 1x1 RGB then you can desaturate your colour combine and add it to the luminance master to pick up a bit of extra detail that way too.

Greg.

[lhansen]

Thanks Greg

I usually do use 2*binning on the RGB channels. But I got dissatisfied with the slight blurring of detail. I usually do LLRGB combines (a la rob gendlers recipe) and normally with pretty reasonable results,

Cheers

lars

[h0ughy]

looks like there is more in that image - you should have a repro

[gregbradley]

Well you are imaging at a long focal length so RGB blurring may be visible that wouldn't show in shorter focal lengths.

How do you do LLRGB combines? Is that the luminance used twice or is it the RGB also used as luminance?

Greg.

[lhansen]

Hi Greg

4039 files are on their way

Workflow is
I do a colour combine in CCDStack
Bring colour and luminance into PS
Adjust luminance
Do a luminosity combine Luminance and colour and flatten
adjusust image
Do another luminosity combine Luminance and colour and flatten

as per: http://www.robgendlerastropics.com/LLRGB.html

Cheers

Lars