M83, GSO RC10 and QHY9

[Grahame (Grahame)]

Hi All,

Much more data needed for this shot but I though I would share anyway.

1 Hour Lum (10 min subs bin 1x1)
45 mins each R,G,B (15 min subs bin 1x1)

I do not have master darks for the longer exposures yet so theres quite a bit of noise in the colour channels. will have to get round to doing some now.

I have cropped this shot due to my bad framing in search for a guide star

Grahame.

[iceman (Mike)]

I like that Graeme, nice work.
Perhaps some high pass or selective sharpening to the arms of the galaxy would make it pop a bit more - it looks a little bit soft on this screen.

Lovely colours.

[Liz]

Beautiful image Grahame. Thats one pretty galaxy.

[Paul Haese]

Grahame, just thought you might like some tips for this image. I imaged M83 with the RC8 earlier in the year and I think these things would help you.

Image this galaxy for 15 minutes in each colour and luminence. The colour should be 2x2 binned as you get nothing really from using 1x1. Try for 3-4 hours of data on the lum and hour or so for the colour. This will give you the data needed to work with.

Good attempt.

[multiweb (Marc)]

Nice one Grahame. As mentioned before you can push the data and contrast further as it's good enough to support a bit more stretching.

[TrevorW]

Plenty of data there Grahame stars look tight good colour, nice diffraction spikes from the GSO, as stated should pop with a little more processing

[leinad (Dan)]

Nice Grahame, can't wait to see the repro when more data is added.
3am post? Must have been up a while processing?

[Hagar (Doug)]

Nice galaxy Grahame, Looks like you could use a bit more exposure to lift the colour a bit more but you have captured some nice detail just the same.

[Lester]

Nice galaxy Grahame. I agree with the others, just needs a bit more exposure to add some more contrast.

All the best.

[Grahame (Grahame)]

Thanks all, it's great to get positive feedback on this one.

Paul: I was trying for detail with the 1x1 bin in the color channel. 2x2 binning from now on! 15 min subs also from now on, not 10.

Agree the image is a little soft, prob due to my efforts to remove the noise in color channels (lack of exposure time) This will be fixed next available opportunity


Cheers everyone!
Grahame.

[Paul Haese]

Grahame the Luminence takes care of the detail, so binning in the colours is fine. You should also find that the longer subs will increase signal and thereby help to reduce the noise in the stack. What temp are you running the cooling now? I have found -20C to be effective at present.

[Grahame (Grahame)]

Paul, I was running the camera at -25 these nights, seems this is getting to the sweet spot for this gear. For the next round of 15min subs i'll bump the temp to -30 for comparison.
You are really setting the standard with your shots too, keep up the great work

[rogerg (Roger)]

Hey Grahame,

Looks pretty nice 10 min and 15min subs... on the G11?

I'd push the curves more to brighten it a bit, show off the detail in the spiral, but my screens aren't calibrated so Agree with some selective sharpening too, and with the 2x2 binning for colour - helps so much having the sensitivity of 2x2.

[Grahame (Grahame)]

Gday Roger,

yup 10 - 15 (evan 20) min subs are a dream now, thanks to the ovision mod in no small way

more data to be collected and re-processed.

Grahame.