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NGC 281 - Pacman nebula (yes another one!)


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Hi All,

I have spent every opportunity this week imaging the said object, despite the lovely moon spoiling things a little.

I really gave it my best with my limited set up and processing knowledge.

Taken using my usual stuff:

SW 150 PDS, EQ5 Pro Synscan GOTO.

Guiding: SW ST80 and QHY5.

Modded Canon 600D and coma corrector with CLS clip filter.

Using: BYEOS, PHD, DSS, Photoshop CC.

A total of 6 hours Light frames,

60 Flats

115 Bias

18 Darks

Any comments, or advice and criticism appreciated.

15219064385_6144dd9633_n.jpgNGC 281 - PACMAN NEBULA by VikN46, on Flickr

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I have been playing with this image and re stacked.

A total of 6 hours Light frames,

20 Flats

18 Darks

I may of over done it on the red now but anyway here it is and as I am quite partial to a monochrome a black and white version.

15037600460_1b54f9e739_n.jpgNGC 281 - Pacman Nebula - REPROCESSED by VikN46, on Flickr

15201371956_4defdb2c8e_n.jpgNGC 281 - Pacman Nebula and a Black and White version by VikN46, on Flickr

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Hello,

Nice image you got there, good going to get 6hrs in. 

My attempt at this with my 600D after about a 105min using my 80ED

L_2014-09-04_NGC281_33_ISO800_105min__25

My preference is to leave some sky in there otherwise the image starts to look to clipped. I have reduced the blue channel slightly to take out some noise.

(Usual workflow also includes using petes actions in PS to reduce the amount of stars)

The 600D is a noisy beast on a hot summers night, although I would have though 6 hrs worth should have produced less noise.

Have you tried to stack cappa sigma without darks? what are your sub lengths and your ISO used?

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Hi Chris,

Lovely image you have there :)

I stacked using Kappa Sigma clipping for the Lights, median for the Flats and Darks in DSS, no bias.

This was a mixture of 220s and 240s all at ISO 200, which is far from ideal but the Moon was washing it all out, I usually manage 300 - 600s at ISO 400 or 800 depending on the target and conditions.

Certainly looking forward to the cooler nights!

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Hi Chris,

Lovely image you have there :)

I stacked using Kappa Sigma clipping for the Lights, median for the Flats and Darks in DSS, no bias.

This was a mixture of 220s and 240s all at ISO 200, which is far from ideal but the Moon was washing it all out, I usually manage 300 - 600s at ISO 400 or 800 depending on the target and conditions.

Certainly looking forward to the cooler nights!

I have been experimenting with ISO400 with 300sec subs, at +- 2hrs integration.

Seems with ISO800 with shorter subs, 90sec, 120sec or 180sec, with many of them to keep noise down and same integration, sometimes get a better result.

Either way I am bugged by pesky heat noise. 

ISO seems to make little difference to the heat noise, it seams only the length of sub makes a difference?

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