image (L=40m, RGB= 10m each) was made through a Tele Vue NP101 refractor and SX HX916 CCD.
composite is useful if the image brightness is reduced, where L= luminance (unfiltered white light image), and one can improve surface feature detail by replacing R by IR, etc.
Remote imaging via the internet is becoming increasingly popular, allowing observers cost effective access to first class equipment in prime dark site locations, and Andy Wilson's photograph, another LRGB
shot (32min L, 2min each RGB), was obtained in this way using a Takahashi Epsilon 250 mounted on a Paramount ME plus SBIG ST-10XME from Global Rent a Scope, New Mexico.
image consisted of 75min Luminance and 21 min each RGB through Astronomik IIc RGB filters.
Martin's exposure (2x180s) was obtained with an SBIG ST9XE CCD while Paul's LRGB
image (50, 40, 40, 40 mins respectively) was made with a SBIG ST10-XME camera.
Mr Tasselli uses the now well-established LRGB
technique to assemble colour images --that is, images taken through red, green and blue filters as well as a 'luminance' (L) image to enhance its overall brightness.