说出你的第一感觉。
本帖最后由 steveyzh 于 2011-3-27 14:24 编辑星特朗 C8
不是我的,别人的,心碎的看15楼,什么补救措施。。。 ::070821_03.jpg::心疼 。。 也是心疼
::070821_03.jpg:: 漂亮~~::070821_17.jpg:: 死的心都有了::070821_15.jpg:: 中间开了朵花。。很漂亮~~~~~~~ 败家子,还是败家子,只能用败家子来形容了::070821_15.jpg:: 俺家是5樓,想跳下去的衝動::070821_15.jpg:: 可怜。比我们学校的还悲惨 不看图看回复都能看出来什么回事了,剩下的给我收藏好了… 唉,实在可惜了啊::070821_11.jpg:: 作孽啊~~~南无阿尼陀佛~ 谁敢比你惨~~~~~~~~~~~~~~~~~~~~~· 本帖最后由 steveyzh 于 2011-3-27 12:55 编辑
谁敢比你惨~~~~~~~~~~~~~~~~~~~~~·
liaorui4088 发表于 2011-3-27 12:27 http://www.astronomy.com.cn/bbs/images/common/back.gif
赫赫,不是我的,别人的
有人看完后,发了这张图,大家看看什么意思....................
The ratio of the C-8 primary is F/2.
I used a rejected C-8 primary (chip on the edge of the mirror) to build a 4.6" aperture lensless Schmidt at F/3.5 for gathering data on variable stars. You can't use it visually since even reducing the aperture to 4.6 inches still leaves 2.5 waves (P-V) of spherical aberration.
Here's a simple design for a 4.5" f/3.46 lensless Schmidt configuration using your C8 8" f/2 spherical primary, using an off-the-shelf plano-convex lens from JML, part number FPX-1197200, 249.2mm EFL, 38.1mm diameter to flatten the field over F-C spectrum and 1.1" diameter. The only kicker is that the PCX lens has to be 0.1" from the CCD or film plane. If it gets any farther lateral color starts killing the performance. If you can't get the PCX lens that close, this won't work.
Just a thought. Sure echo the sentiments about your plate, but that primary should still be a beautiful sphere, ROC 32", and useful for something. 可惜 可惜了了::070821_17.jpg:: 好凄惨!没有包装好! 心都碎了,天空从那一刻起在也没有光芒了::070821_17.jpg:: 哦NOyct61.gifyct61.gifyct61.gif
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