File:M4 and M22 with Telephoto lens (8486498227).jpg

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Subject: M4 and M44

Image Size: 1000 x 1000 (each half) Image FOV: 37 minutes by 37 minutes (each half) Image Scale: 2.22 arc-second/pixel (50% reduced) Date: 2011/05/07 and 2011/05/08 (Processing backlog of old images)

Exposure: M4: 9 x 5 minutes, M22: 10 x 5 minutes, ISO1600, f/8 Camera: Unmodified Canon T2i/550D Lens: Nikon 800mm f/5.6 AI-S, at f/8 (sharpest) Mount: Astro-Physics AP900

Guiding: ST-402 autoguider through TV-102iis guidescope, Maxim DL autoguiding software


Processing: Raw conversion and calibration with ImagesPlus; Aligning and combining with Registar. Final processing in Photoshop -- levels adjustment, cropping to 2000 x 2000, 50% reduction to 1000 x 1000, combining two panels, JPEG conversion, etc.

Remarks: SQM-L reading start/end = 2156/21.61 (M4); 21.58/21.49 (M22)

The focus on M4 appears to be off, resulting in the fuzzy stars.
Date
Source M4 and M22 with Telephoto lens
Author s58y

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by s58y at https://flickr.com/photos/45032885@N04/8486498227. 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
current11:34, 19 December 2021Thumbnail for version as of 11:34, 19 December 20212,001 × 1,000 (1.18 MB)Siloepic (talk | contribs)Transferred from Flickr via #flickr2commons

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