I bought my Bushnell AN 78-9565 refractor a while ago, and it states that I am supposed to be able to view the stars, nebulae and planets with a great amount of satisfaction. The only problem is, I can only view the moon with pleasing results... I can't view the stars, other planets or nebulae. I feel cheated and have have tried everything possible to be able to obtain the same viewing results as many others who have purchased the same model Can you help me? Is there a telescope book for dummies? I sure feel like one!
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Re: telescope is only good for viewing moon...help!!!
Your scope is 565mm focal length with a 60mm objective which makes it f:9.5. (telescope focal length divided by lens diameter) all this means that the optics are capable of viewing larger planets. nebula is a bit of a stretch. maybe under exceptionally dark skies with at least 30min. of dark adaptation. brighter objects like m42 or m31 should be visible, bear in mind that only very large telescopes will resolve the slightest hint of color in nebulosity. the rest of us are reserved to gray scale. i would suggest using a 26mm eyepiece plossl if available. next make sure your finding system is aligned to the scope. this is best done during the day at a distant object like a radio tower. center the object in the eyepiece then align the finder. next get your self a good sky map like stellarium software a freebie and a fav. to ensure your looking at what you think your looking at.
a word on eyepiece selection. magnification is calculated by dividing the focal length of the scope by the focal length of the eyepiece. for instance the scope is 565mm the recommended eyepiece is 26mm so the magnification would be around 22x. a rule of thumb for optics is about 50x per inch of objective. which means your scope is good for about 100x. so by the math you would use a 5.6mm e.p. to achieve 100x, however as optical powers increase field of view decreases making it difficult to find objects. find your object with a wide field e.p. then switch to a higher power to zoom in. if the image gets fuzzy at high power attempt to refocus, if it doesn't clean up either your asking a bit to much from the scope or seeing conditions in the upper atmosphere may not be ideal. what ever you do don't give up there are some amazing things to see out there.
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Astronomical telescopes usually show an upside down image. There is a good reason for this- erecting the image needs more bits of glass in the light path, which reduces the amount of light and increases aberrations. Even if this is only slight, astronomers prefer to avoid it, and they don't really care which way up the Moon or Jupiter appear.
It is possible to fit an erecting prism or eyepiece to most astronomical telescopes, and some of them come with one. For a reflector, an erecting diagonal of the kind that is often used on a refractor is of no use. There are other types of erecting adaptors or eyepieces. However, unless you wish to use the telescope for terrestrial viewing, for which a reflector is badly suited anyway, you might as well fall in with the tradition that astronomical observations are made upside down.
Use the 20mm to view an object (building, tree etc.) far away during the daytime. Align the finderscope to the object. To view the moon, leave the scope out to equalize the temperature for at least 1/2 hour. Use the 20mm and no barlow. Point the scope towards the moon by sighting along the barrel of the scope, then use the finder to zero in on the moon. You may then switch to the 4mm eyepiece. for a more magnified view of the moon. You will have to keep moving the telescope because of the earth's rotation. The higher the magnification, the more you will have to adjust the scope. Because of the cheap finderscope, finding the planets will be difficult. Best to always sight down the length of the scope to get you close. The planets will be small and indistinct. This is not a astronomical telescope! May be used for views of the moon
but the cheap mount is not suitable for other planets. Max power would
be 225x NOT 420x as advertised. The erecting prism is for terrestrial
use only. Nothing discourages an amateur astronomer more than a toy store telescope. My advise would be to use this scope for nature watching and go buy a good telescope (Meade, Celestron, Orion etc.). Even Those 60mm refractors are superior to this! A descent scope would cost a minimum of $200
You can't. This is a toy, not a real scope. The largest FOV is with your lowest power (biggest number) eyepiece. If interested in wide field views, buy a GOOD telescope with a low focal ratio (below f/8)
Currently the rings of Saturn are nearly edge on so you won't see any details in them. Shortly the rings will appear edge on and the ring will disappear completely for a few months. Gradually, they will return and angle more towards Earth at which time you will be able to see some of the ring details.
There are many factors that can reduce your ability to see planetary detail. I had my Celestron 200mm out the other night looking at Saturn but saw no details because the atmosphere was too unstable. There are also limits to what a telescope can realistically view.
There is a general rule of thumb that states you can expect to view 50x per inch of aperture. Your telescope has roughly 5" of aperture. 5 times 50 equals a maximum of 250x. However, this is a guideline. On bad nights like I had you'll never reach that 250x since objects will appear blurry or unstable. On good nights, you can exceed this.
You can calculate your telescope power by dividing your telescope focal length by the focal length of the eyepiece ( that 4,9,20mm number).
An excellent object to look at when it comes back in view is Jupiter. It's always interesting and you can see four of it's moons.
I'm not sure what type of telescope this is (refractor, reflector, etc.) but it's normal for most telescopes to have inverted images. There is no up or down in space so it doesn't really matter when you view an astronomical object. You just want to keep that in mind if you use a moon map so that you can get the correct orientation. However, you can get moon maps with inverted images.
If you wish to view land or terrestrial objects you can purchase an image erecting prism to turn everything right side up. Depending on the telescope it may reverse the images from left to right when it does this.
Try the largest eyepiece you have (20mm, 25mm) for a wide field of view. Of you try to view the moon with too much power (smaller mm eyepieces) it will always come out blurry - too close for such magnification.
What eyepieces sizes have you used? Try using the largest eyepieces you have (20mm, 25mm or higher) for a wide field of view. If your eyepiece is to small (maybe 15mm or below) you will have too much magnification and the moon will be a blur.