File:SH2-132 - H-alpha + RGB (4539751164).jpg

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Subject: SH2-132, SH2-134 part, SH2-135, etc..

Image FOV: 7 degrees by 4.666 degrees (420 minutes by 280 minutes)

Image Scale: 16 arc-second/pixel

Date: 2009/09/19

Exposure: (RGB) 6 x 10 minutes + (H-alpha) 6 x 10 minutes = 2h total exposure, ISO800, f/3.4

Filter: (RGB) IDAS LP supression, (H-alpha) Astrodon 5nm H-alpha filter

Camera: Hutech-modified Canon 30D

Lens: Leica APO Telyt-R 180mm f/3.4 at f/3.4

Mount: Astro-Physics AP900

Guiding: ST-402 autoguider and TV102iis guidescope. MaximDL autoguiding software using 5-second guide exposures


Processing: Raw conversion and calibration with ImagesPlus (dark frames, bias frames, and flat frames); Aligning and combing with Registar; Levels adjustment, cropping/resizing, JPEG conversion with Photoshop CS. No sharpening or noise reduction. H-alpha converted to grayscale image. Then, Ha and RGB images re-aligned with Registar, using the CROP/PAD option to export the registered Ha and RGB images. Photoshop Apply Image used to combine the exposted Ha and RGB images:

- Final red channel = 0.8*Max(RGB-red, Ha-red) = 0.2*Ha-red

- Final green channel = 0.8*Max(RGB-green, 0.3*Ha-red) = 0.2*Ha-red

- Final blue channel = 0.8*Max(RGB-blue, 0.4*Ha-red) = 0.2*Ha-red

Remarks: (RGB) Temperature at end 35, SQM-L reading at end 21.43; (H-alpha) temperature at start/end: 35F/33F; SQM-L reading start/end: 21.43/21.33
Date
Source SH2-132 - H-alpha + RGB
Author s58y

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This image was originally posted to Flickr by s58y at https://flickr.com/photos/45032885@N04/4539751164. It was reviewed on 19 December 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

19 December 2021

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Date/TimeThumbnailDimensionsUserComment
current11:27, 19 December 2021Thumbnail for version as of 11:27, 19 December 20211,575 × 1,050 (1.07 MB)Siloepic (talk | contribs)Transferred from Flickr via #flickr2commons

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