File:M4 (4490415302).jpg
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Captions
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Summary
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| Description |
Subject: M4 Image FOV: 1 degree square (60 by 60 minutes) Image Scale: 4 arc-second/pixel Date: 2009/05/30 Exposure: 12 x 5m = 1 hour total exposure, ISO800, f/5.6 Filter: IDAS LP Camera: Hutech-modified Canon 30D Lens: Nikon 800mm f/5.6 AIS Mount: Astro-Physics AP900 Guiding: ST-402 autoguider through SV66 guidescope, Maxim DL autoguiding software with 6-second guide exposures Processing: Raw conversion and calibration with ImagesPlus (dark and bias frames only, no flat frames); Aligning and combining with Registar. Final processing (levels adjustment, cropping, resizing, JPEG conversdion, etc.) in Photoshop. Remarks: Temperature = 39F/35F start/end; SQM-L readings: start = 20.50 (half moon), end = 20.88 (moon setting) |
| Date | |
| Source | M4 |
| Author | s58y |
Licensing
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- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
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This image was originally posted to Flickr by s58y at https://flickr.com/photos/45032885@N04/4490415302. 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. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 11:31, 19 December 2021 | | 900 × 900 (292 KB) | Siloepic (talk | contribs) | Transferred from Flickr via #flickr2commons |
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