M20

[ReaPerMan]

Have only just got around to processing this data. Had to fight some quite bad gradients caused by an uncooperative street light near my house! Anyway here it is.


Object M20
Date Taken: 29/04/2012
Telescope: GSO RC10 CF
Aperture: 254 mm
Telescope Mount Model: Skywatcher EQ6PRO
Camera Model: QHY10
Frames: 25 x 480 secs, Darks applied
Integration Time:3 hr 45min
Guiding Method: SSAG (Maxim DL)
Software CCDStack2, PS4
Bortle Scale Zone: 4

Larger image here (http://www.pbase.com/paulstorey/image/142331997)


Thanks for looking

all the best

Paul :thumbsup:

[multiweb]

I suspect the underlying data is excellent and given the integration time I'm a little surprised about the noisy appearence. Did you by any chance sharpen this picture or use any noise reduction algo on it? It's quite a good shot at that FL but something's gone wrong in the processing IMHO.

[ReaPerMan]

Thanks Marc,

I have had a good look at the data and there seems to be a fair bit of noise, I strongly feel that the Gain setting for the QHY10 is set too high. I have gone back over my graphs for setting the gain and after hitting the QHYCCD site feel that I need to make an adjustment. As for the processing I had not run any sharpening but I had also not run any noise reduction. I've had a bit of a go in a repro here and hope that I haven't done too much.

Many thanks for the useful comment.

Paul

[bmitchell82]

I think the issue is the raw data coming off the camera itself paul, like we have discussed. :( Although the noise suppression has worked, i feel its deleated fine details which is a shame.

The other thing to note is this is what a 2000mm FL scope on a EQ6 guided by..... a 50mm finder guider........ Says something for the EQ6 when its tuned properly! ;)

BM

[Shiggy]

H Paul,
What was your gain and tolerance set to on the QHY10?
I have just started playing around with one and I'm still trying to find the sweet spot.

Cheers
Shaun