The Red Filtered Crab Nebula

Yellow Filter
Blue Filter
Red Filter
No Filter

As you might have predicted, when viewed through the red window on your filter wheel the Crab Nebula looks much different than through the blue cellophane. Here we can see all of the cooler, red gas on the outer edges of the nebula which was mostly invisible in the image before.

When you have viewed all the filtered images let's discuss why filters are useful.

Blue Filtered Crab Filters Lesson Why Use Filters?