NGC2261 Hubble's Variable Nebula in Hydrogen Alpha Light

Click on image to enlarge 

Hydrogen Alpha only

Taken January 2, 2004 from my backyard in Castro Valley, Ca.

C14 imaging scope @4430mm focal length (f/12.46) stabilized with mirror locks and with camera angle adjuster

FLI IMG1024S imaging camera @ -40C

SBIG AO7 Adaptive Optics System

SBIG ST7E Guide/AO control camera @-20C

RCOS Dichroic Beam Splitter for AO7/IMG compatibility

FLI CFW 1 filter wheel

Custom Scientific Narrowband Emission Line Filter

   Hydrogen alpha        656.3nm  3nm FWHM 

Exposure details:

3 exposures of 20 minutes for Halpha

1 hour total exposure time

Maxim DL used for IMG1024S control

CCDSOFT 5.00.71 used for AO7/ST7E control

Sigma prebeta 11 used for darks, flats, biases and light combine

SGBNR used for smoothing

Photoshop CS used for final touch up

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