ASTRONOMY MAGAZINE STAR PRODUCT OF THE YEAR 2011 Vendor of the Boren-Simon POWERNEWT Astrographs www.powernewts.com www.pbase.com/tango33 Scopes: 6",8",10" F/2.8 Boren-Simon Carbon-Fiber POWERNEWT 8" GSO Carbon RC Mount: ASA DDM60 PRO NEQ6 Mount Camera: SBIG ST8300 M with BAADER LRGB Ha-O3-S2 filters ORION STARSHOOT PRO 2 ( color)
SkyMonsters - http://www.skymonsters.net
GSO RC8/Takahashi FSQ85ED Canon 450D/QSI583wsg
Takahashi EM-200 GEM/Vixen Super Polaris
Its true - in any hobby - that someone can do things better than you. However, not to do something because you aren't the best would ignore the value and satisfaction of the journey.(TimN)
Quote:BTW: With a fast scope such as yours I would not bin IMHO.
flickr photos: http://www.flickr.com/photos/24719437@N03/
Mach1GTO / G11/G2 (stock) / AT6RC / AT10RC / TMB92SS / Astrodon 50D / STT-8300M / FW8G-STT / PixInsight / etc, etc. Astrobin - Flickr
Clear skies http://www.starkeeper.it http://stelledelcielo.blogspot.com/
Quote:L is necessary for faint objects and better SNR
So L has more detail and so forth - but it doesn't do anything to improve the SNR of the color channels.
Quote:This way the RGB signal was not just used to tint the Lum channel. In other words, we have the data we might as well use it!
Quote: Quote:This way the RGB signal was not just used to tint the Lum channel. In other words, we have the data we might as well use it! Sure - that makes perfect sense. But people think that LRGB is a way actually to improve the color accuracy of an image - by somehow increasing the SNR of each R,G,B channel. I claim this is incorrect, and cite Berry/Burnell as a source that gets it right. LRGB relies on a perceptual trick to make a color image look better - by spending more imaging time on luminance than color. The result just looks better - but the inherent color accuracy or "SNR" has not been improved.So people shouldn't feel there is an inherent SNR win by doing LRGB vs. RGB. But there is a chance the end result would be perceived as higher quality and look better - or not.Frank
Quote:Thanks Ken - That all looks good to me. I think it's great you were able to incorporate the color channels to improve the depth for the scientific goals of the project - and at the same time get nice color images of the galaxies to provide context for the star streams.As for LRGB - I'm a believer that it *should* work to make a nicer looking result with more detail and better colors - but I think a key problem for me is slight spherochromatism in my c11 with reducer that makes it hard for the star sizes in different colors to match exactly so the end result looks natural. I assume I could mess with it in processing - but my main message is for people to give it a try, but it may not work as automagically as hoped - and there is no *inherent* improvement in the actual color SNR.Thanks,Frank
Quote:The Luminance has a higher signal to noise ratio than any particular colour of RGB.
Therefore in the faint areas of the picture -
luminance will enable us to see the low s/n data which would otherwise be invisible in the noise.
The only test would be on a very faint object such as a galaxy & in particular it's faint arms.
14.5" Starmaster with ServoCat and Argo Navis 1966 Unitron 4" Model 152 EQ Tec 140 TV NP101 f/5.4 APO Telvue .8 Focal Reducer FLI ML8300 and CFW-2-7 filter wheel Astrodon Gen2 RGBL 2" filters Baader 2" Narrow Band Filters Borg 50mm Guide Scope/ATIK Titan Guide Camera AstroPhysics AP900 Losmandy GM-8 Gemini
Photo: Qhy9 mono + qhy 5x2" filter wheel and Baader 2" LRGB, Ha, O3 and S2 filters , Meade DSI Pro 2 as guider, TS 9mm off-axis guider Binoculars: Nikon Action 12x50 Telescopes: Skywatcher Evostar 120ED f7.5 APO + TS 2" flattener Mounts: HEQ5 Pro Eyepieces: Nagler 11mm type6, Pentax XW 7mm, Televue 2X barlow 1.25"
Quote:PixInsight allows you to extract Luminance from RGB using 1:1:1 RGB ratio.