本帖最后由 弼马温1984 于 2017-2-19 00:36 编辑
原文： Chapter 2 Planning Your Telescope When you build a telescope, no time isbetter spent than that invested in the planning stages that precedeconstruction. Ideally, planning is something you take slowly—it's the time when your dream and enthusiasm for your futuretelescope meld into a plan that you know will work During that time, you decide how big yourtelescope should be, How you will build it, and how you will use it when it’sready for the star. You maybe tempted to rush ahead—go ahead, be tempted—but slow downand really study this chapter. After all, don’t you want to know what you aregetting into？ Let's begin with a little scenario. It’sthe evening after a long day at work. Dinner is over and you’re at home sittingon your comfortable living room sofa. The afternoon clouds and the sky hasturned sparkling clean. Now—do you have theenergy haul that dream telescope of yours to a dark site? Are you ready to setup in the dark? Do you feel enthusiasm about making fifty trips up and down a12-foot stepladder? How do you anticipate feeling on the long drive back home? Do you think you’ll feel guilty when youwonderful big telescope collects dust instead of starlight？What does your spouse think of your nutty fascination with telescope？You’d better think about that one carefully, because your spouse’s attitudemakes a big difference in the satisfaction you gain from astronomy. It sounds like we are trying to discourageyou, rest assured that we are not. Rather, we want you to think about whatbuilding a telescope will mean to your life. We would rather see you happy witha small telescope than miserable with a big one. So our advice to you is this: if you arethe least bit apprehensive, stick with a telescope under 18 inches aperture. Ifyou have serious doubts, then build an 8-inch or 10-inch telescope. Smallscopes are easier to use, and if you find your interest building toward theobsession level, then you can always go bigger. The point is to build a scopethat is easy for you to use, and then explore the universe with it. So much for the Zen of telescope making. Ifyou decide to build a telescope, Section 2.3 of this chapter is very important.Why? We tell you in what sequence you should order, build, and assemble thecomponents of your telescope. Other chapter give you the details of how tocarry out the various steps of construction, but here you learn what to buildfirst, what next, and so on. Now we know that you can build a telescope any wayyou please and we can’t do anything about it, but the reason we wrote this bookwas to save you a lot of time and trouble. Study thoughtfully and we think youwon’t regret it.
译文：
第二章 规划你的望远镜
当你做一个望远镜时，没有什么时间能比花在前期计划阶段更值得的。理想的情况下，规划要慢慢做，这时你关于望远镜的梦想和激情融入到规划中，它必将是可行的。
在这段时间里，你要决定做多大的望远镜，如何制作，还有在繁星如何使用它。你可能像一蹴而就，但请放慢脚步认真学习本章，毕竟，你不想知道你将跳进一个什么样的深坑吗？
让我们从一个小场景开始。这是漫长一天工作后的夜晚，晚餐结束了，你坐在舒适的客厅沙发上。午后的云朵已飘远，天空已变得通透。现在—你有动力拉你的梦想之镜到一个黑暗的地方吗？你准备好在黑暗中安装它吗？你能想象在12英尺高的梯子上下50回的酸爽吗？在长途开车回家的路上，你会有什么样的感觉？
你认为当你的大望远镜收集尘埃而不是星光时，你会感到内疚吗？你家领导会觉得你的望远镜很帅吗？你最好仔细考虑一下，因为你家领导的态度能大大影响你从天文得到的乐趣。
听起来好像我们在劝阻你，但放心，我们不会。相反，我们建议你思考一下你做的望远镜会对生活有什么影响。我们宁愿看到你在自行车上笑，而不是在宝马车里哭。
所以我们给你的建议是：如果你有一点担心，那用18英寸以下的望远镜吧。如果你很担心,那就做个8寸或10寸的望远镜。小镜子更容易使用，而且如果你发现你开始走火入魔，那就让逼格来得更猛烈些吧。要点就是做一个你能轻松驾驭的望远镜,然后再和她一起探索宇宙。
做望远镜是一门艺术。如果你决定要做一台望远镜，那本章的2.3节是很重要的。为什么呢？因为我们会告诉你如何按步骤购买、加工和组装望远镜的各个部件。其它章节会为你介绍各个步骤的细节，但这里你会学到先做哪个，再到哪个，按部就班。当然我们知道你可以任性不按常理出牌，我们干预不了，但我们写这本书的理由，就是要帮你节省时间，少走弯路。深入学习本书，我们认为你不会后悔的。
心得： 很抱歉，未能进入正题，在耐心等等，第一章我已经略过了很多内容，以后有机会再填坑，但我觉得这些内容还是值得分享一下的，不仅是DIY，买成品镜子也一样，花钱之前先问自己一系列的问题，而且回答时别太自信，真的，别太自信，这很重要但很难做到，尽量吧。 分享一下QQ群里看到的一个图表，请看下图： 略微夸张，但基本符合现实，然而普通版中间的“不存在”偶尔存在时，一大半会因“懒”而被忽略掉。懒无贬义，毕竟很多时候我们休息的时间也是很珍贵的，不知能否做到一边观星一边放松。好像也挺难的…… 终极版暂时无解，想方设法拉领导进坑吧。
| 
置顶卡
变色卡
千斤顶
显身卡