tornado33
16-02-2008, 10:53 AM
Here is planetary nebula Abell 12, in Orion, looking like a ghost image next to a mag 4 star. Its odd that Abell put this on the list as normally Abell planetaries are VERY low surface brightness faint objects. This is so bright it readily showed up in 30 sec test images @ISO1600
The actual image here is
5x5 mins ISO400. UHCS filter, MPCC. Modded 350D ,10 inch f5.6, hand guided off axis by usign the Q guider to put a star on the screen and manually making corrections, 0.3 sec updates. One stoppage 1/2 way through the run because of cloud patches. Im surprised the faint stars are as sharp as they are as the guidestar was literally boiling in iffy seeing. Some gust of wind jiggled things around too.
There is a full frame reduced size, and a full res. crop image
I normally do 10 minute subs but I wanted to avoid too much saturation from the bright star, Im lucky my diffraction spike didnt cut the planetary in half too :)
Processed with dark, flats as usual in IRIS and finished in PS
Scott
The actual image here is
5x5 mins ISO400. UHCS filter, MPCC. Modded 350D ,10 inch f5.6, hand guided off axis by usign the Q guider to put a star on the screen and manually making corrections, 0.3 sec updates. One stoppage 1/2 way through the run because of cloud patches. Im surprised the faint stars are as sharp as they are as the guidestar was literally boiling in iffy seeing. Some gust of wind jiggled things around too.
There is a full frame reduced size, and a full res. crop image
I normally do 10 minute subs but I wanted to avoid too much saturation from the bright star, Im lucky my diffraction spike didnt cut the planetary in half too :)
Processed with dark, flats as usual in IRIS and finished in PS
Scott