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望远镜的分辨率如何计算？
能够计算的只有理论分辨率。根据瑞丽极限，望远镜的分辨率为140″/口径，但此数值只有在25x每英寸口径的情况下才可实现，手持双望基本都不适用。
此外，理论分辨率也不是实际分辨率，实际分辨率受研磨、装配等等诸多因素影响，理论分辨率基本已没有参考价值。
实际分辨率可以通过USAF分辨率测试卡大体测得，以下是老外目视所测部分镜子的实际分辨率，可以总结的规律：
1.实际分辨率主要受倍数影响，倍数越高，分辨率越高。
2.同样倍数看口径，口径越大分辨率越高，但也有反例，比如oberwerk的856不如两个842。
3.同口径同倍数的镜子，品质不同分辨率也有差别。
注：clearly see=看清 see=看到 barely see=勉强 suspect=有无之间 no see=无法分辨
20x80 Garrett Gemini clearly see 4.9",see horz, susp vert 4.37", no see 3.9"
20x80 Burgess LW clearly see 5.4", see horz lines only 4.83", no see4.3"
18.7x80 Anttler clearly see 6.08", barely see 5.4", no see 4.83"
16x70 Fujinon FMT SX clearly see 6.08", suspect 5.4", no see4.83"
15x70 Oberwerk Ultra clear 6.82", seen 6.08", see horz, vert susp5.4", no 4.83"
15x70 Oberwerk clearly see 6.82", horz only 6.08", suspect 5.4"
12x50 Nikon SE clearly see 8.61", see both 7.65", no see 6.82"
12x50 Nikon AE clearly see 8.61", horz only 7.65", no see 6.82"
10x70 Fujinon FMT SX clearly see 9.67", see 8.61", no see 7.65"
10x60 Oberwerk Mariner clearly see 9.67", suspect 8.61", no see7.65"
10x50 Nikon AE clearly see 9.67", suspect 8.61", no see 7.65"
10x50 Pentax PCF WP clearly see 10.8", suspect/see 9.67", no see8.61"
8x56 Oberwerk clearly see 13.64", horz only 12.12", no see10.83"
8x42 Swift Ultralite clearly see 12.12", suspect 10.83", no see9.67"
8x42 Fujinon BFL clearly see 12.12", diff. see 10.83", susp barely9.67"
7x50 Captain's Storm King clearly see 13.64", suspect/see 12.12", nosee 10.83"
7x50 William Optics 7x50 ED clearly see 13.64", see 12.12", suspectsee 10.83"
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------------------------我想请问一个问题： 你列举的望远镜分辩率规格里没有列举10X42规格的，对吧？！ 那么，请问一下施华NL10X42的分辩率大概是多少角秒（”）？ 如5” ？ 6” ？我想，至少应该高于7x和8x才正常，对吧？！谢谢
