深谋远虑
发表于 2025-3-21 17:01:54
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hemoglobin
发表于 2025-3-21 20:52:19
1431-9756 t only different classes of refractor but also different tel.Choosing and Using a Refracting Telescope has been written for the many amateur astronomers who already own, or are intending to purchase, a refracting telescope – perhaps to complement their existing arsenal of larger reflecting telescope
Functional
发表于 2025-3-22 02:30:31
Book 2011thing similar. Thirty years ago, there was little choice available to the hobbyist, but in the last decade long focus crown-flint achromats have moved aside for some exquisitely crafted apochromatic designs offered by leading commercial manufacturers. There has been a huge increase in the popularity
HAVOC
发表于 2025-3-22 07:21:40
1431-9756the last decade long focus crown-flint achromats have moved aside for some exquisitely crafted apochromatic designs offered by leading commercial manufacturers. There has been a huge increase in the popularity978-1-4419-6402-1978-1-4419-6403-8Series ISSN 1431-9756 Series E-ISSN 2197-6562
Baffle
发表于 2025-3-22 12:15:09
https://doi.org/10.1007/978-1-4419-6403-8Amateur astronomical observing; Apochromatic refractors; Astronomical imaging; Astronomical webcams; Ast
碳水化合物
发表于 2025-3-22 13:49:30
978-1-4419-6402-1Springer Science+Business Media, LLC 2011
碳水化合物
发表于 2025-3-22 21:04:01
Neil EnglishProvides an in-depth look at classic and contemporary refractors from many different manufacturers, and explains how to use them Compares not only different classes of refractor but also different tel
rectum
发表于 2025-3-23 01:17:03
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occult
发表于 2025-3-23 03:02:43
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MAZE
发表于 2025-3-23 08:43:26
10楼