M1 Crab Nebula in Ha and [NII] Light

Click on image to enlarge 

Ha = Red, [NII] = Green, [NII] = Blue

Click on image to enlarge 

Hydrogen Alpha only

Click on image to enlarge 

[Nitrogen II] only


The color  image and two component images above split the Ha and [NII] lines using very narrow band filters. The Ha emission line is located at 656.3nm and the [NII] line is located at 658.3nm. In a wider filter, the Ha and [NII] lines would both be passed. Filters such as the Schuler Ha or the Astronomik Ha will not separate the Ha from the [NII] lines. The 3nm FWHM Custom Scientific filters can separate the two lines as this image reveals.

Taken December 26, 2003 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

   [Nitrogen II]                658.3nm  3nm FWHM

Exposure details:

3 exposures of 45 minutes for [NII], Halpha

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

Photoshop CS used for final touch up

Buy this and other images here

Hit Counter