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描述 40mm的52°串联最长的焦距也是唯一的2.0英寸O.D.本系列的目镜。探索科学现在有三个40毫米目镜,其他两个是40mm 62°系列和40mm 68°系列。在这个焦距上,这个目镜通常保留给挑战自己的深天空观察者,以使自己观察到望远镜最淡淡的可观察到的极限。巨大的真实视野非常适合诸如A...
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