 Let me show you another very handy card. The Field of View card allows your visitor to see how much of the sky your telescope is looking at. How much of the sky they're seeing in the eyepiece. Hold this card at arm's length. Close one eye and look through this hole that says Backyard Telescope. That's how much of the sky you can see in many telescopes at 70 to 100 power. About half a degree. Now arm lengths and telescopes differ, so views may vary slightly. If you're using an eyepiece with higher magnification, the area of the sky is likely to be smaller. The rest of the holes represent the field of view of various space-based and ground-based telescopes NASA uses to study the universe. How much of the sky can the Hubble Space Telescope see compared to this telescope? When you see a photo taken by the Hubble, or one of these other telescopes, that's the amount of sky they were imaging when the telescope took that picture. There are several ways to use this card. Have you ever had your visitors not understand how much of the sky they're seeing in the scope? They often think it's a much larger area than it really is, don't they? At the telescope, hand it to your visitor. Have them hold it at arm's length. And point to the area of the sky that you're looking at. Have them frame the hole over that area. And they'll be very surprised, most likely. Some won't believe you. Try it on a terrestrial object. From our regular viewing site, you can see a distant hill with an antenna on it. Before dark, I'll train the scope on the antenna. And then have the visitors use the card to frame the hill and the antenna, and then look in the scope. They'll see it really is the same field of view. You can also prove it to them using the moon. Ask your visitor if they think the moon will fit in the half-degree hole. They'll probably say, no way. Then have them try it with the card. It is the same field of view when they look in the scope. Use it to demonstrate the moon illusion that the moon really is the same size near the horizon as it is higher in the sky. When looking at a bright star through the hole, visitors may notice that the star seems to fill up quite a bit of the hole. But when they look through the scope, the same star appears to take up a much smaller area, and they'll see a lot more stars. Many people believe that telescopes make the stars look bigger. They may be surprised to see that the stars look smaller. You might want to give these away as prizes at your events. You can print them on cardstock. And masters and instructions for making them are in the manual on the manual and resources CD. Or you can order more cards from the Astronomical Society of the Pacific. Instructions for ordering these cards are in the manual.