M42 -- The Great Orion Nebula
Starlight Express SXV-H9 on 3.5" Questar at f/15.
Dec 10, 2016.
Picture taken with my Freshman Seminar class.
L=Ha+OIII, R=Ha=5m, G=B=OIII=4m, (in 15-sec increments).
Richardson-Lucy deconvolution, Log stretch, and Noise Reduction in Photoshop.
Starlight Express SXV-H9 on 3.5" Questar at f/5.5.
February 15, 2004.
L=Ha+OIII, R(Ha)=60m, G=B(O-III)=57m, (in 3-min increments).
Log stretch and Star Debloat and Photoshop tweaks.
Full-Size: 1358x1012