M-1 The Crab Nebula

10” LX-200 @ f/3.3
Genesis KAF-0401
VIS only
R:G:B 10:15:26 Minutes 60 second exposures

 

  This is my first RGB of the Crab. In a fit of logic I removed the clear filter, since it only served to add two more reflections. Guess what, Dave. It also keeps the image scale the same in white as it is in all the color layers! The difference is 2.8%. So I left out the white data. The frames are not flat fielded, since I can't get a reasonable flat.

The following image is my first CMY.

M-1 The Crab Nebula

10” LX-200 @ f/4
Genesis KAF-0401
VIS only
W:C:M:Y 32:20:15:10 Minutes 60 second exposures

 

  This image is particularly interesting when contrasted with the one above. Here the color of the tendrils is more uniform, and if everyone else is right, is more accurate. The background stars, or any stars for that matter, are a whole different thing. The stars all seem to be the same color - even the dim ones. Over processing will often saturate the luminance, leaving no room for chrominance. This is not the case here. The RGB above does not have this problem. The background stars are of many different colors. The effect of saturation of the luminance layer can be seen in the brightest stars in the RGB.

M-1 The Crab Nebula

10” LX-200 @ f/4
Quickcam Grayscale
32 x 40 seconds
WhiteLevel ?
Contrast ?

 

  This image is a reprocess of a stack made in February of 2000. I used the "New Normal" dark subtraction, and stacked with auto registration. The new dark subtraction routine has proven to work very well with frames made with the ABG disabled, but actually produces a negative image when applied to frames made with the ABG enabled.