subcutaneous
发表于 2025-3-21 18:46:51
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免除责任
发表于 2025-3-21 22:46:02
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唤醒
发表于 2025-3-22 01:56:24
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Lamina
发表于 2025-3-22 07:41:14
The 12- to 16-inch Dobssolution and light-gathering power. The gain in brightness is always more profound than the gain in resolution. If you step away from an 8-inch Dob and place your eye at the focus of a 16-inch instrument, the first thing you’ll notice is how much more bright (4-fold) the objects have become. Only af
贪心
发表于 2025-3-22 12:23:57
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Dysarthria
发表于 2025-3-22 12:57:48
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Dysarthria
发表于 2025-3-22 18:03:06
Accessorizing Your Dob many of these telescope have such fast focal ratios (from f/3.3 to f/4), Seidel aberrations such as coma, distortion, and field curvature can be problematic, but a good optician ought to be able to reduce spherical aberration and astigmatism to very acceptable levels, even for a fast mirror. In thi
Incorruptible
发表于 2025-3-22 22:05:22
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轻推
发表于 2025-3-23 03:36:00
Sketching and Imaging with Your Dob open clusters, and faint galaxies that skirt the great dark of interstellar space. The spectacular light-gathering power of even an 8-inch or 10-inch ‘scope has inspired many amateurs to try their hand at astronomical sketching and astrophotography. This chapter explores some of the extraordinary a
flaggy
发表于 2025-3-23 08:47:56
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