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The lenses usually come from defective or old photocopiers, allowing for the objective to be obtained for free or at a low cost. They are usually modest diameter lenses, ranging from 50mm to 60mm, of short focal length, good for use in a portable, wide-field telescope, but unsuitable for higher magnifications. Given the use of good components ...
Erfle eyepieces are relatively cheap to produce, and are still produced for many binoculars as well as for telescopes used by amateur astronomers. [3] The book Classic Telescopes describes Erfle as a “famous Zeiss employee...who in 1921 patented a practical design for a wide-angle ocular. Erfles usually consist of five elements comprising two ...
The Swedish 1-m Solar Telescope, with a lens diameter of 43 inches, is technically the largest, with 39 inches clear for the aperture.The second largest refracting telescope in the world is the Yerkes Observatory 40 inch (102 cm) refractor, used for astronomical and scientific observation for over a century.
MD.Life Monocular Telescope. $42 $600 Save $558 ... It even comes with a tripod and smartphone holder so you can take photos and videos through its lens. ... This discount brings it down to within ...
Some telescopes are classified by the task they perform; for example Solar telescopes are all designs that look at the Sun, Dobsonian telescopes are designed to be low cost and portable, Aerial telescopes overcame the optical shortcomings of 17th-century objective lenses, [1] etc.
Right: The two lens auxiliary eyepiece. Background: The focus tube and main telescope tube containing the achromatic doublet objective lens. The Galileoscope uses a 32 mm (1 + 1 ⁄ 4 in) focuser, giving the telescope a great deal of versatility, since this is the standard size for eyepieces used in