的确不知道AP，TV，TMB，MONO，TS等词的意思, 是望远镜品牌么?
毕竟是新手没接触过真不熟悉, 很奇怪前辈是怎么看出我在国外的?
0 Y+ B e) l0 j天文望远镜器材评测和交流论坛昨天我也试着自己读写参考资料了解了解,毕竟不懂的太多了以至于都不知道自己什么不懂
. 我会陆续把我不懂的,不清楚的,刚刚学到的都整理下贴上来. 不过我觉得自己学业更重要了,天文只是业余爱好.我只能用业余时间像周末来泡论坛学习所以我更新会很慢. 请各位前辈多多关注,耐心指导.谢谢
5 P- k8 e; Q- R7 s; M9 Y; R天文论坛,天文,望远镜,天文望远镜,apo,ed,televue,tv,tmb,高桥,ap,tec,望远镜评测，望远镜测评,双筒望远镜，天顶，目镜，望远镜配件，赤道仪
5 g2 `0 G* i. a+ w' y天文望远镜器材评测和交流论坛下面是我昨天学习的总结:
& E6 {# }! A5 o6 J+ E: t# |- Y天文望远镜器材评测和交流论坛 D 有效口径 Diameter / Aperture ：指物镜的有效直径；也即望远镜的通光直径。望远镜的口径愈大，聚光本领就愈强，愈能观测到更暗弱的天体。
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F 焦距 focal length ：望远镜的焦距主要是指物镜的焦距。determines how wide an angle the telescope can view with a given eyepiece 目镜or size of a CCD detector or photographic plate.
天文望远镜器材评测和交流论坛. I2 b# ?$ `% L/ N1 D# ~5 G, S3 ?
A 相对口径 / 光力 Aperture/light-gathering power ：相对口径又称光力，它是望远镜的有效口径D与焦距F之比，它的倒数叫焦比（F/D）。
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F/D 焦比 f-ratio, focal ratio or f-number ：焦距与有效口径之比。the ratio between the focal length and the aperture of the objective. For a given aperture (light-gathering power), low f-ratios indicate wide fields of view. It is more difficult to reduce optical aberrations 光学相差in telescopes with low f-ratio than in telescopes with larger f-ratio.
天文望远镜器材评测和交流论坛! N$ m( D& a$ U3 a' H$ h( V0 A, O8 A
ω 视场 fields of view : 天文望远镜的视场大约是目镜视场和天文望远镜的倍率的比值。望远镜的视场与倍率成反比，倍率越大，视场越小。
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M 倍率 Magnification ：天文望远镜的倍率等于物镜焦距与目镜焦距之比，也等于物镜入射光瞳与出射光瞳之比。因此，只要变换不同的目镜就能改变望远镜的放大倍数。The basic scheme is that the primary light-gathering element, the objective 物镜(1) (the convex lens 凸透镜or concave mirror 凹面镜used to gather the incoming light), focuses that light from the distant object 物体(4) to a focal plane where it forms a real image 实像(5). This image may be recorded, or viewed through an eyepiece 目镜(2) which acts like a magnifying glass放大镜. The eye 眼睛(3) sees an inverted magnified virtual image 放大像(6) of the object.
天文论坛,天文,望远镜,天文望远镜,apo,ed,televue,tv,tmb,高桥,ap,tec,望远镜评测，望远镜测评,双筒望远镜，天顶，目镜，望远镜配件，赤道仪! t. N' l! d3 y, Z; M
aR (单位：角秒) 角分辨率 angular resolution or resolution limit 指望远镜能够分辨出的最小角距。Ignoring blurring of the image by turbulence in the atmosphere (atmospheric seeing)视宁度 and optical imperfections of the telescope, the angular resolution of an optical telescope is determined by the width of the objective, termed its "aperture" (the primary mirror, or lens.) The Rayleigh criterion for the resolution limit αR (in radians) is given by αR = 1.22λ / D, where λ is the wavelength and D is the aperture. For visible light (λ = 550 nm), this equation can be rewritten:αR = 138 / D. Here, αR denotes the resolution limit in arcseconds and D is in millimeters. In the ideal case, the two components double stars can be split even if separated by slightly less than αR. This is taken into account by the
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Dawes limit αD = 116 / D.
0 R3 ?/ _3 l4 l! P0 @: k: ^1 P天文论坛,天文,望远镜,天文望远镜,apo,ed,televue,tv,tmb,高桥,ap,tec,望远镜评测，望远镜测评,双筒望远镜，天顶，目镜，望远镜配件，赤道仪 分辨能力 aR-1
& k' q* s% Z0 c. L4 T( c# V: [参考自 1.观星天文论坛-初级天文入门指导5.0
% n" N1 k4 G8 D4 I3 v3 E国内专业的天文望远镜器材评测和交流论坛，致力于如高桥、televue、tmb、ap、tec等顶级望远镜和附属器材2. wikipedia:
http://en.wikipedia.org/wiki/Optical_telescope天文家园欢迎您！' C, k" Q$ v X+ |, ]6 {, X i D
图怎么贴不上呢? 基本上照搬参考书应该不会有理解错误吧. 问题:1我想知道相对口径的英文简写该是 NA呢还是A. 因为也看到用NA的,英文全称是什么呢? 2相对口径与有效口径有什么区别呢?
