Early refracting telescopes with non-achromatic objectives were constructed with very long focal lengths to mask the chromatic aberration. An Achromatic telescope uses an achromatic lens to correct for this. An achromatic lens is a compound lenses made with two types of glass with different dispersion.
Considering a scope or binocular that has an APO lens but unsure what that means? Our guide to distortion and Apochromatic lenses will help!
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Building a Copyscope The key component of a Copyscope is an objective lens that must be sourced from a photocopier, preferably with an f-ratio of around f4 to f6. Other parts of a Copyscope include an eyepiece, typically with a barrel diameter of 1 1/4 inches with a focal length of 17 to 20 mm or longer.
The Galileoscope is a small mass-produced refractor telescope, designed with the intention of increasing public interest in astronomy and science. It was developed for the International Year of Astronomy 2009.
A monocular is a miniature, low powered telescope or spotting scope which you hold in your hand like a binocular but use with one eye like a telescope. A monocular shares characteristics with both binoculars and spotting scopes, but is much smaller than either.
The design overcame the need for very long focal lengths in refracting telescopes by using an objective made of two pieces of glass with different dispersion, "crown" and "flint glass", to limit the effects of chromatic and spherical aberration.
The Leica APO-Televid 65 spotting scope is one of the best optics in the hunting optic industry. With a brand like Leica, you’re guaranteed to have unsurpassed image quality when they promise you an optic with APO lenses.