Understanding Eyepieces - the Brevard Astronomical Society
Understanding Eyepieces - the Brevard Astronomical Society
Understanding Eyepieces - the Brevard Astronomical Society
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Barlow Lenses<br />
A Barlow is a negative<br />
lens that increases <strong>the</strong><br />
effective focal length<br />
of <strong>the</strong> telescope.<br />
http://www.astunit.com/tutorials/barlow.htm<br />
<strong>Brevard</strong> <strong>Astronomical</strong> <strong>Society</strong>
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