The Yellow Filtered Crab Nebula

Yellow Filter
Blue Filter
Red Filter
No Filter

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? Filters Lesson Blue Filtered Crab