File:AR 2305 in Hydrogen alpha (16707394420).jpg

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This was a first for me. First time I successfully managed a Hydrogen alpha image with a zoom lens (TeleVue PowerMate x 2.5). Previous attempts were usually curtailed by cloud or suffered from a lot of dust motes and an artefact called Newton's Rings. In this case, I had both dust and artefacts but used a flat frame to subtract them from my image which worked very well. I also used Thierry Legault's tip to tap the scope when taking the flat frame as this causes vibration which blurs out any residual half-focused image from the Sun.

Celestron 100/100mm scope with 70mm Ha filter. TeleVue PowerMate x 2.5 Skyris 273m CCD camera

Ioptron ZEQ25GT mount with Hinode guider.
Date
Source AR 2305 in Hydrogen alpha
Author john.purvis
Camera location55° 02′ 53.87″ N, 6° 55′ 43.18″ W Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

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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 john.purvis at https://flickr.com/photos/16271433@N02/16707394420 (archive). It was reviewed on 25 September 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

25 September 2018

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current08:18, 25 September 2018Thumbnail for version as of 08:18, 25 September 20181,255 × 1,113 (766 KB)PlanetUser (talk | contribs)Transferred from Flickr via #flickr2commons

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