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Amateur Astronomy for Beginners - Telescopes Part 1

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The difference between refractors and reflectors and the importance of size.

Channel: Howto & Style
Uploaded: November 30, 1999 at 12:00 am
Author: truemartian

Length: 04:09
Rating: 4.79
Views: 19381

Tags: astronomy  reflector  refractor  telescope  

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Video Comments

tompa666 (November 30, 1999 at 12:00 am)
my telescope has a power of 800 x
alltruth969 (November 30, 1999 at 12:00 am)
Hey there truemartian It's me agian, I got my self an Orion 60mm refractor and I'm hopeing to have better luck with this one rather then my 900mm reflector. I still kept my reflector, but I'm thinking of joining an Astronomy group in my spare time. I'm hoping they will give me information and knowledge on using my reflector, however I really want to thank you alot for all your advice and hopefuly I can be as good as you some day. :)
fredo1070 (November 30, 1999 at 12:00 am)
God, Ed Norton's career has gone down hill. American History ETX.
alltruth969 (November 30, 1999 at 12:00 am)
yeah I will try it tonight for sure. For a first time telescope do you think that I should have got a refractor rather then a reflector? I herd that the refracter is a little more simple to use.
truemartian (November 30, 1999 at 12:00 am)
If your finderscope is aligned properly then what you see in the crosshairs should appear dead center of the lowest power eyepiece. Practice pointing it at bright stars and the moon.
alltruth969 (November 30, 1999 at 12:00 am)
yes I do belive my finder scope is aligned, that was one of the first things I did was take it back to where I bought it from and they showed me that my "aimer" was right smack dab in the center of the mirror and was also in the center of my finder scope. So everything was aligned properly, and according to the telescope manual it should be working fine, because everything about correct alignment in the manual was exactly how my telescope looks. So not sure why I would'nt be getting an image?
truemartian (November 30, 1999 at 12:00 am)
Imaging and visual observation are two different things. Exposure time is only for taking pictures, what we now call imaging in the electronic age. If you are having problems visually observing an object check to make sure your finder scope is aligned properly. I have a video on how to do that.
alltruth969 (November 30, 1999 at 12:00 am)
by the way this isn't for photography its just for imaging with my own eye, so do I still need to allow enough exposure time and stillness?
alltruth969 (November 30, 1999 at 12:00 am)
oh ok, Thank you so much for the tips, this will help me out alot. I guess I wasn't patience enough. I will try it out now and see what happens. Thanks again :)
truemartian (November 30, 1999 at 12:00 am)
To make an image of a dim object like a star you have to open the camra shuter for a longer period of time than say for something like the moon. For exampl to get a good moon shot the camra shuter has to be open exposing the chip or film only 1/1000 of a sec. To image a bright star it requirs a minimum of 2-10 secs. So for that 2-10 secs you need to be able to hold the telescope precisely stil relativ to the star you are imagng. Which means you need a trackng mount to compnsate for earths spin.

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