Comet Lulin | Niels V. Christensen

Photographer
Niels V. Christensen
Email
nvcchr@mail.dk
Location of photo
Copenhagen, Denmark
Date/Time of photo
27,28 Feb-2009
Equipment
The picture is taken with Canon 20Da, ISO800 and WO FLT-110 without field flattener for FLT used. Total exposure time ~ 90min. Dark and flat frames used. Filter: 2" IDAS LPS. Guide via Meade 16" LX200ACF, FR3.3 and DSI-I Camera.
Description
The BG layer consist of 5 pictures: 5*30sec which are tracked on the comet kernel and which are aligned and stacked (average combined) on stars. The FG, comet layer, consist of 38 pictures: 10*60sec; 12*120sec; 15*180sec; 1*600sec; which are tracked on the comet kernel and which are aligned and stacked (median combined) also on the comet kernel. Median combine remove the star tracks. The FG, comet layer is then masked together with the BG layer via APS CS4; thereby integrating the best/relevant information from the two layers.
Website
http://home20.inet.tele.dk/nvc_homepage_dk/