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These are the largest fluorite apochromatic refractors available in the world.
这是世界上最大的APO折射镜了。
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Apochromatic refractors are available with objectives of up to 553mm in diameter, but most are between 80 and 152mm.
高度消色差折光镜的口径已经可以做到553毫米的直径，但多数仍在80～152毫米之间。
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Apochromatic refractors''' have objectives built with special, extra low-dispersion materials.
高度消色差折射镜'''使用特别的材料，特别低色散度的材料，来制造物镜。
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Takahashi also makes observatory telescopes which include: 350mm hyperbolic astrographs, 300 and 400mm Cassegrains, 200, 250 and 300mm triplet apochromatic refractors and the large EM-3500 mounts to carry them.
高桥也制造天文台用的350mm双曲面镜，300和400mm的Cassegrains， 200，250和300mm的三片APO折射镜以及支撑它们的大型EM-3500赤道仪。
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Since their introduction in the early 17th century, refractors have suffered from one major defect: chromatic aberration.
色差是折射式望远镜自18世纪初推广以来所具有的主要缺陷。
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refractors：折光镜
0911 光度计 photometers | 0911 折光镜 refractors | 0911 分光镜 spectroscopes
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Uh, the eight-bar refractors go up to 180 millimeters. Hi, Adam：八条折射器上升到180毫米 嗨 亚当
Uh, the eight-bar refractors go up to 180 millimeters. Hi, Adam.|八条折射器上升到180毫米 嗨 亚当 | Hi. Michael's looking for a telescope to buy for her cottage in... | For deep space in a static positi...