File talk:17pHolmes 071104 eder vga.jpg

Here are picture details:
instrument: TMB 130/780 apochromat with field flattener
camera: modified Canon EOS 350D (Baader filter inside)
mount: Synta EQ6 + Boxdörfer DynoStar
guiding 72/500 refractor, SBIG St-4
exposure time: 15x5min at ISO800
location, date: Mount Pilis (near to Budapest), Hungary; 11.04.2007
observing conditions: transparency: 7/10, seeing: 2/10, temp.: +3°C
processing: Iris, Registar, Photoshop Neat Image
I'd like to add few words about astro photography to explain a little bit what this all means. The creator of the image used a telescope with equatorial mount. This type of mount could follow the sky movement (for at least some time) in order to show the stars as points and not as star trails. He took 15 exposures (for 5 minutes each) and then he stacked them in one image using Registar. It is a very common practice in astrophotography. --Mbz1 (talk) 14:04, 21 November 2007 (UTC)