Question about Optics
I was given a BSA Optics telescope with no manual and I cannot figure out how to use it. Can someone please tell me how to get it where I can see through the eye piece?
Set the scope up looking at something in the distance in the daytime.
Start with the lowest power and that is the highest numbered eyepiece (i.e. 25mm or 40mm, NOT 5mm for example). Be sure NOT to use the 2x or Barlow lens.
Use a star diagonal if you have one and set the focus about 1/2 way out between all the way in and all the way out.
Move the focus in and out while looking through the eyepiece.
The object should be at least 100 yards away.Once focussed, you work your way up to higher powers. Generally the rule is to use the lowest power that
wil show you the subject, since you "run out of light" as you enlarge the subject more and more.
Always remember telescopes are for gathering light and making faint things visible better rather
than emphasizing power or magnification.
Seek help at a local astronomy club if this doesn't work. They ahould be helpful.
Posted on Nov 13, 2008
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Posted on Jan 02, 2017
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