Comments on: Propeller Nebula https://astrodoc.ca/propeller/ Astrodoc.ca - Images of the Universe Mon, 24 Dec 2018 15:04:27 +0000 hourly 1 https://wordpress.org/?v=7.0 By: Ron Brecher https://astrodoc.ca/propeller/#comment-9280 Sat, 15 Sep 2018 14:08:15 +0000 http://astrodoc.ca/?p=10827#comment-9280 In reply to Mark Kuehner.

Thanks Mark. I have updated the processing description. I initially omitted to describe that I made a SynthL from the L, R, G and B masters. Sort of a “best of both worlds” or compromise approach. I am now using a camera with a 7-position filter wheel, so can shoot luminance on very clear dark nights. I then throw that in the pot with the RGB masters. I compare the SynthL to the L alone, in terms of SNR and noise, and then use the better of the two. Usually, that is the SynthL. With my previous camera, with a 5-position wheel, I used RGBHaO3 and no luminance filter.

]]> By: Mark Kuehner https://astrodoc.ca/propeller/#comment-9279 Sat, 15 Sep 2018 13:44:12 +0000 http://astrodoc.ca/?p=10827#comment-9279 Great image Ron! Usually you use a synthetic L but on this image you shot an actual luminance layer. Would you mind explaining your thought process as to how you decide which way to go. After talking with you at the Buffalo workshop you convinced me to use a synthetic L which has worked out quite well for me and saved me some time acquiring data.

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