File:IC1318 area with CLS filter (8478157212).jpg

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Original file (4,752 × 3,168 pixels, file size: 3.45 MB, MIME type: image/jpeg)

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Summary

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Description

Subject: IC1318, NGC6888 and the Gamma Cygni area.

Image Size: 4752 x 3168 (100 % full frame) Image FOV: 15 degrees by 20 degrees Image Scale: 11.4 arc-second/pixel

Date: 2011/07/01 (Processing backlog of old images)

Exposure: 20 x 10m = 3 hour 20 minutes, ISO1600, f/2.8 Filter: Astronomik CLS Camera: Hutech-modified Canon T1i/500D Lens: Contax/Yashica 85mm f/2.8 Mount: Astro-Physics AP900

Guiding: ST-402 autoguider through TV-102iis guidescope, Maxim DL autoguiding software with 6-second guide exposures


Processing: Raw conversion and calibration with ImagesPlus; Aligning and combining with Registar. Final processing in Photoshop -- levels adjustment, cropping to 4752x3168 to remove ragged edges from alignment, JPEG conversion, etc.

Remarks: Temperature start/end = 50F/49F; Humidity start/end 72%/68%; SQM-L reading start/end = 21.37/20.99 (sunrise?)

This must have been taken with a lens of about 85-90mm focal length. If so, it was probably taken with the Contax 85mm f/2.8 lens rather than the Nikon 105mm f/2.5 . The shooting log for the night of 2011/06/30-2011/07/01 does not mention a lens change between the last photo and this one, so it was assumed to be the 105mm/2.5 lens. This would mean that the wrong flat frame (105mm/2.5 lens + CLS, rather than 85mm/2.8 lens + CLS) was also used for calibration
Date
Source IC1318 area with CLS filter
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@N04/8478157212. 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 20214,752 × 3,168 (3.45 MB)Siloepic (talk | contribs)Transferred from Flickr via #flickr2commons

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