stacking more subs would reduce noise but if you're going for 5 mins, I'd suggest 800iso to keep noise low.
I'd also suggest dithering the subs, that would give you better noise reduction when stacking.
what ota were you using?
Colours and guiding look great.
Cheers
stacking more subs would reduce noise but if you're going for 5 mins, I'd suggest 800iso to keep noise low.
I'd also suggest dithering the subs, that would give you better noise reduction when stacking.
what ota were you using?
Colours and guiding look great.
Cheers
Hi Alistair,
Good advice. I've been meaning to work out the dithering function on BackyardEOS/PHD. I was using the 10" Meade SCT with f/6.3 flattener/reducer.
Jon. I agree with Alistair. Out of interest what is the focal ratio of the scope? Are you urban or rural?
Urban, sadly. Last month I moved from a rented shack in the middle of nowhere to a house in suburban Canberra. On the edge, thankfully. And Canberra's better than some places.
The scope is 2540mm - an LX200 Classic 10". I was using the f/6.3 focal reducer/flattener for this capture.
You could try as low as iso400. Slower integration may provide better control over star colour and size and increase dynamic range. Personally, I find 1600 too high. The image is quickly dominated by sky glow due to light pollution.
Good work again for this small nebula. I noted the stars appeared to have bloating appearances ( I could be wrong), so as a learning experience I downloaded your image without prior consent and did some deconvolution and morphologicaltrans in PixInsight and minor brightness, contrast and saturation in PS. Hope you dont mind
Here is the reprocessed image, not sure if that makes any difference.
Regards
David
Last edited by DavidNg; 04-06-2013 at 10:06 PM.
Reason: typo
Good work again for this small nebula. I noted the stars appeared to have bloating appearances ( I could be wrong), so as a learning experience I downloaded your image without prior consent and did some deconvolution and morphologicaltrans in PixInsight and minor brightness, contrast and saturation in PS. Hope you dont mind
Here is the reprocessed image, not sure if that makes any difference.
Regards
David
Don't mind at all - I must learn this processing witchcraft! Looks like I'm going to have to invest in pixinsight :-)
3km from you, Logan, if this locator thingy is to be trusted! I'm in Latham, but my balcony faces East, so the Helix was rising over Westfield Belconnen at 2 am as I took these subs :-)
I do suspect our light pollution is better than the big cities like Sydney and Melbourne. We're very spread out, have a lot of modern street lighting, and the altitude helps too. When I moved a month ago from a sheep farm out on Uriarra Rd into the suburbs, I bought a CLS filter. I've only used it once visually and never photographically.
