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How To Select and Align Finderscopes?

29 Mar 2019, 23:31 UTC
How To Select and Align Finderscopes?
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Finders are essential pointing devices. Now that we have a telescope that will gather light and an eyepiece that will magnify the image, we need a way to accurately point the telescope at what we want to see, our target for observation. Finders have a wider field of view than the typical telescope. Depending on what low power eyepiece is used, the typical amateur telescope will likely have a maximum field of view of between .7 degrees and 3 degrees. Naturally, some will be narrower and some can be wider, but this is a good example range.This means that you can only see a small portion of the sky through the eyepiece. Imagine trying to find something you lost and having to look for it while viewing through the cardboard tube of a roll of toilet paper. Your field of view would be quite small which would make it hard to find things.A finder’s field of view can range from about 4 degrees to as wide as your eye can see. This makes it much easier to find what you are looking for in the sky. So the finder and the telescope work together as a team to help you ...

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