Having purchased and received ~24/10/2010 a Hutech LPS-P2 48 x 0.75 mm light pollution filter, I took a series of JPEG images with and without the filter to determine the skyglow levels at my home location of Willetton in the suburbs of Perth. I used some useful information found at
www.pbase.com/samirkharusi/image/37608572&exif=Y in doing this. This image is a subset of the images acquired and shows that the filter is quite effective at removing the pinkish skyglow and increasing the possible exposure time from less than 90 seconds to over 180 seconds for around 20% RGB histogram light levels, the generally recommended maximum for deepsky objects.
Unguided near Zenith with the aim of capturing sky-glow rather than objects to gauge the level of light pollution. White balance accidentally set to Fluorescent lighting.
Post processed in Adobe Photoshop CS5.
Telescope - Apogee Ortho
Star LOMO 80/480 without Field Flattener, With and Without Hutech LPS-P2 light polution filter, Canon 400D DSLR, Ambient xxC not noted. Mount - Skywatcher NEQ6 Pro. Guidescope - Orion ShortTube 80 with
Star Shoot Auto Guider - unguided shots.
Comments