Telescope stats explained - BBC Sky at Night Magazine
A Barlow lens increases the focal length of a telescope without
Telescopes and Microscopes
3 Radio Telescopes and Radiometers‣ Essential Radio Astronomy
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Simple Formulas for the Telescope Owner - Sky & Telescope - Sky & Telescope
focal length telescope
The Arecibo Legacy Fast ALFA Survey
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Cassegrain formulas.
Light Vortex Astronomy - Article: How to Very Accurately Calculate your Telescope's Effective Focal Length
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astronomical optics, part 2: telescope & eyepiece combined
Formulas - Telescope Magnification
Low-Vision Aids - American Academy of Ophthalmology
The Plate Scale of a Telescope
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Telescope Focal Length Explained: Why Does It Matter? | StarLust
Optical telescope - Wikipedia
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Laser Beam Expanders | Edmund Optics
ASTRO-10 Lecture 11
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astronomical optics, part 3: the astronomical image
