The Yellow Filtered Crab Nebula
The image above should look similar to the Crab Nebula when it is
viewed through the yellow window on your filter wheel. The yellow
cellophane looks yellow in color because it is absorbing all colors except
yellow. This piece of cellophane allows the yellow light from the image to
pass through it. The bright portions of the red and blue gas in the image
also have some yellow light in them so they pass through this window and
you are able to see most of the image. Try the blue and red filter buttons
to see what happens to the image through those filters.
When you have viewed all the filtered images let's discuss why filters are useful.
What did you see?
Blue Filtered Crab