sadr


Wider…Wider…

In my earlier attempt to capture the Spaghetti Nebula I found that the 200mm camera lens wasn’t quite wide enough.  And that a faster (lower focal ratio) lens would also be beneficial.  So I put an 85mm f/1.8 Nikkor lens (stopped down to f/2.8) on the QSI camera and tried again last night.  It didn’t work.  The moon was full last night, and even with a 3nm H-alpha filter, there was enough sky illumination to almost completely overpower the Spaghetti.  I’ll try it again when the Moon goes away, but I have to comment again on what this says about […]


IC 1318 (Sadr Region)

Buy a Print This is a large region of nebulosity (mostly hydrogen) around the star Sadr in the constellation Cygnus. From Wa-chur-ed Observatory in May of 2011. As is usual for this observatory, this is a narrowband image, consisting of a hydrogen-alpha image for the red channel and oxygen-3 for green and blue channels. Scope: AT111EDT at f/5.6 Mount: Orion Atlas/EQMOD Camera: QSI 583 at –25C Exposure: 10 x 480 seconds H-a, 7 x 480 seconds O-3 (2 hrs 16 mins total)