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These are readily available from your local camera store. • If you wear corrective lenses (specifically glasses), you may want to remove them when observing with an eyepiece attached to the telescope. However, when using a camera, you should always wear corrective lenses to ensure the sharpest possible focus. If you have astigmatism, corrective lenses must be worn at all times. Accurate alignment of the finder makes it easy to find objects with the telescope, especially celestial objects. To make aligning the finder as easy as possible, this procedure should be done in the daytime when it is easy to find and identify objects. To align the finder: 1. Choose a target that is in excess of one mile away. This will eliminate any parallax effect between the telescope and finder. 2. Point the telescope at your target and center it in the main optics of the telescope. You may have to move the telescope slightly to center your target. 8 Calculating Magnification Your First Look 3. Adjust the screws on the finder bracket, tightening one while loosening another, until the crosshairs are centered on the target seen through the telescope. Image orientation through the finder is inverted (i.e., upside down and reversed from left-to-right). This is normal for any finderscope that is used straight-through. Because of this, it may take a few minutes to familiarize yourself with the directional change each screw has on the finderscope. You can change the power of your Celestron telescope just by changing the eyepiece (ocular). To determine the actual magnification with any given eyepiece, simply divide the focal length of the telescope by the focal length of the eyepiece. In equation format, the formula looks like this: Focal Length of Telescope (mm) Magnification = - Focal Length of Eyepiece (mm) Let’s take an example (using the 80mm AZ) to see how this formula works. Let's say you're observing with a 25mm eyepiece. To determine the magnification, you would simply divide the focal length of the telescope (910mm) by the focal length of the eyepiece. Since we are using a 25mm eyepiece for our example, you would divide 910 by 25. This yields a magnification of 36 power. Although the power is variable, each instrument has a limit to the highest useful magnification. The general rule is that 60 power can be used for every inch of aperture. For example, the Firstscope 80 AZ is 3.14" (80mm) in diameter. Multiplying 3.14" by 60 gives a maximum useful magnification of 188 power. Although this is the maximum useful magnification, most observing is done in the range of 10 to 30 power for every inch of aperture which is about 30 to 100 power for the Firstscope 80 AZ. Higher powers (more than 60x the diameter) can be used for looking at super enlarged images of the planets and the moon, but the images will be dark with little contrast, and somewhat fuzzy. With the telescope fully assembled and all the accessories attached, you are ready for your first look. Your first look should be done in the daytime when it will be easier to locate the locking clamps and adjustment knobs. This will help to familiarize you with your telescope, thus making it easier to use at night. Daytime Observing 1. Find a distant object that is fairly bright. 2. Insert the standard eyepiece into the diagonal. 3. Locate the object in the finderscope. 4. Use the slow motion knobs to center the object in the field of the finder. 5. Look through the main optics and the object will be there (if you aligned the finder first). 9 Try using different optional eyepieces to see how the field changes with various magnifications. Observing the Sun, Moon, and Planets Observing Deep-Sky Objects NEVER POINT YOUR TELESCOPE AT THE SUN UNLESS YOU HAVE THE PROPER MYLAR SOLAR FILTER. PERMANENT AND IRREVERSIBLE EYE DAMAGE MAY RESULT AS WELL AS DAMAGE TO YOUR TELESCOPE. ALSO, NEVER LEAVE YOURTELESCOPE UNATTENDED DURING A DAYTIME OBSERVING SESSION, ESPECIALLY WHEN CHILDREN ARE PRESENT. Although overlooked by many amateur astronomers, solar observation is both rewarding and fun. However, because the Sun is so bright, special precautions must be taken when observing our star so as not to damage your eyes or your telescope. Never project an image of the Sun through the telescope. Tremendous heat build-up near the back of the telescope can damage any accessories attached to the telescope. Use a Celestron mylar solar filter to view the Sun in complete safety. These filters reduce the intensity of the Sun’s light making it safe to view. With these filters you can see sunspots as they move across the solar disk and faculae, which are bright patches seen near the Sun’s edge. Be sure to cover the lens of the finder when observing the Sun. This will ensure that the finder is not damaged and that no one looks through it accidentally. In the night sky, the Moon is a prime target for your first look because it is extremely bright. Often, it is a temptation to look at ...

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