不吉祥的女人
发表于 2025-3-25 04:03:38
https://doi.org/10.1007/978-3-642-91971-8idered to give excellent images at the expense of being long and unwieldy, but this ingenious 110 mm (4.3 in) f/15 folded refractor of simple construction and outstanding optical quality can be packed into a shoebox for transportation.
EXTOL
发表于 2025-3-25 10:33:23
https://doi.org/10.1007/978-3-663-20307-0nstrument custom-made by a manufacturer. Terry Platt’s telescope is an excellent example of an instrument being built to meet a specific need which could not be met by commercially available instruments. He uses this 318 mm (12.5 in) f/20 unobstructed reflector for planetary CCD imaging.
figment
发表于 2025-3-25 12:31:12
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镶嵌细工
发表于 2025-3-25 17:57:29
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酷热
发表于 2025-3-25 22:31:51
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Exuberance
发表于 2025-3-26 00:47:11
https://doi.org/10.1007/978-1-4471-0567-1CCD; instruments; photography; planet; telescope
拍下盗公款
发表于 2025-3-26 05:40:15
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结束
发表于 2025-3-26 10:02:30
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Rct393
发表于 2025-3-26 13:03:11
“Skinflint”: A 15.5-inch f/4.8 Reflectorscopes or optics. Gil Stacy has found creative uses for commonly available materials and artefacts, much of which many people would class as scrap, to build his “Operation Skinflint”, a 15.5 in f/4.8 Dobsonian reflector for a cost of less than $400.
altruism
发表于 2025-3-26 20:36:51
Building a High-Contrast Planetary Newtoniane trick to increase contrast and improve image quality. This project typifies the way that ATMs adapt common techniques learned from earlier work in order to attain their aims in constructing a non-standard instrument.