User manual BUSHNELL REFRACTOR EQUATORIAL MOUNT

[. . . ] Coincidentally this star is perfectly north EVERY night you go out. It is generally around 25 to 45 degrees up from the horizon in North America. The second star you will need to be able to identify in the sky is a little bit harder. The second star can really be any star in the sky other than our sun and the North Star. [. . . ] When you are aligning the finderscope or centering a star or planet in the telescope there will be a time when only small adjustments will be necessary. That is when you'll use these knobs. Notice one is long and the other is short. It really doesn't matter which one goes on the declination and which one goes on the right ascension. Generally though, they go on just like the below diagram. They connect to the telescope mount only one way so I won't cover their attachment procedure. Declination Fine Adjustment 898 7 23 22 21 20 19 18 Right Ascension Fine Adjustment If your equatorial mount is set up correctly, you can move just the Right Ascension Fine Adjustment Knob ONLY to follow any star across the sky! 190-200-210-220-230240-250-260-270-280-290 4 Telescope Axis's When using your fine adjustment cables, you'll be moving these two axis's. This instruction manual refers to 3 axis's in which the telescope will turn. This diagram illustrates these axis's where the telescope can move. 5 The Different Lenses There are many different lenses to know about on a refractor telescope. Each has a specific function that also goes on in a specific order. If you try different combinations other than what is listed in the next few pages, you will not be able to see out of your telescope clearly. I'll introduce you to each of the lenses and their functions. The Eyepieces 4mm Eyepiece This is the high-powered eyepiece. It is generally shorter than the 20mm eyepiece. 20mm Eyepiece This is the low-powered eyepiece. It is generally taller than the 4mm eyepiece The Barlow Lens This piece multiplies the magnification by generally 2 to 3 times. The Barlow Lens 5 BARLOW Most of the time it will say 2X or 3X on the side of it. Every once in a while it will even have a different number. The Erector Lens All telescopes turn the image upside down. This piece can "erect" the image. The Erector Lens 4 ERECTOR Erecting the image is only available on Refractor telescopes. Erecting Lenses generally multiply the magnification by 1. 5 times. The Penta Mirror All telescopes make the image appear to move in the opposite direction as you are turning it from right to left. The Penta Mirror corrects this and allows you to look down into the telescope instead of having to look from behind. The Penta Mirror It multiplies the magnification by 2 times. 3 The Diagonal Mirror The Diagonal Mirror allows you to look down into the telescope instead of having to look from behind. It does not correct the right to left viewing. The Diagonal Mirror This piece offers no additional magnification. As well, most all Refractor telescopes come with either the Penta Mirror or the Diagonal Mirror but never with both. 3 6 Figuring the Magnification Magnification is generally referred to as "power". Figuring the power on a Refractor telescope sometimes can be tricky because of all of the different combinations possible. Below I'll go into the different combinations and how to figure each magnification. To figure magnification you must first know the basic formula for determining it. [. . . ] Sometimes they adjust with thumbscrews on the outside of the mounting bracket and sometimes they have actual fine adjustment knobs on the finderscope itself. Regardless, you will need to determine how to adjust them yourself using common sense and if you have it, the instruction manual. 11 898 7 23 22 21 20 19 18 190-200-210-220-230240-250-260-270-280-290 You can generally leave the Counterweight all the way down and tighten the screw so it won't move. Get everything at right angles. If you're not sure, just make it look like this picture. As well, on level ground make sure the tripod legs are fully extended or at least even as far as length. Note: It is recommended for best viewing to not look through a window when aligning the finderscope or even when viewing things through the telescope. [. . . ]