M1 Crab Nebula in [SII], Ha and [OIII] Light

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[SII] = Red, Halpha = Green, [OIII] = Blue

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[Sulfur II] only

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Hydrogen Alpha only

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[Oxygen III] only


Click on comparison image to enlarge 

comparison of Emission line filter image versus HaRGB image*

* HaRGB image used courtesy of Rick Krejci

(this comparison shows how emission line imaging blocks the broadband synchrotron emission from the Crab's pulsar)


Finally, here is an animation of the Crab


Emission line images taken December 26-27, 2003 from my backyard in Castro Valley, Ca.

C14 imaging scope @4430mm focal length (f/12.46) with Camera Rotator and stabilized with mirror locks 

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

   [Sulfur II]                     672.4nm  3nm FWHM

   Hydrogen alpha        656.3nm  3nm FWHM 

   [Oxygen III]                 500.7nm 3nm FWHM   

Exposure details:

3 exposures of 45 minutes each for [SII], Halpha, [OIII] filters

6 hours 45 minutes 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

Photoshop CS used for final touch up

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