Not so long time ago two entries preseting monochromatic hydrogen alpha images appeared at my blog. These were Cygnus Wall in NGC7000 and Lagoon and Trifid nebulae. Now both of these frames are enriched with color that comes from wideband RGB filters and narrowband filters: hydrogen alpha and oxygen III.
At the first glimp of an eye both images look very different. This is due to the images scale. First one was made using Samyang 135mm f/2 telephoto lens. Second one was made with Meade 10″ ACF telescope at effective focal length 1830mm. So this second image covers less than 1% of the area captured in the first image (and of course of the different part of the sky 🙂 )
But actually both captured areas have lot of things in common. They both present molecular clouds of interstellar matter. They both show fragment of the Milky Way. Both are rich in emission nebula gases but also in dark matter. New stars are being born in both imaged areas. And both images were captured with similar technique – using monochromatic camera and the same set of filters: RGB color ones, and narrowband Ha and Oiii. It is amazing how Universe is different and similar in the same time when observed in totally different scale.
Cygnus Wall image technical data: Date: 28-31 August, 2019 Location: Nieborowice, Poland Telescope: Meade ACF 10" Corrector: AP CCDT67 Camera: QHY163M, gain 100 Mount: SW EQ6 Guiding: SW 80/400 + ASI290MM Exposure: Ha 200x2 minutes, Oiii 75x2 minutes, RGB 50:40:40 x 30 seconds Conditions: seeing good, transparency average
Lagoon and Trifid image technical data: Date: 1-3 August 2019 Location: Tenerife, North Telescope: Samyang 135/2 @ f/2.8 Camera: QHY163M, gain 100 Mount: iOptron SmartEQ Pro Guiding: 30mm guidescope + ASI290MM Exposure: H alpha 50x120 seconds, Oiii 20x120 seconds, RGB 40:30:40 x 30 seconds Conditions: transparency good, Moon