Path: utzoo!attcan!uunet!lll-winken!lll-tis!helios.ee.lbl.gov!pasteur!ucbvax!hplabs!hp-pcd!hpcvlx!ben From: ben@hpcvlx.HP.COM (Benjamin Ellsworth) Newsgroups: comp.graphics Subject: Re: A Question of Perspective (?) Message-ID: <350002@hpcvlx.HP.COM> Date: 24 Jun 88 00:51:14 GMT References: <350001@hpcvlx.HP.COM> Organization: Hewlett-Packard Co., Corvallis, OR, USA Lines: 37 First, I want to thank everyone who has taken the time to answer my question. I both got the answer that I needed, and education in some areas that I found interesting. Now we get to the good part... .. the answer is... ------DRUM ROLL----- OK, ok, just give me a moment to wipe the egg off of my face. 30" or 2.5' Award for simplest derivation going to similiar triangles (recipients too numerous to mention). Award for best clarifying example to Jack C. Morrison "... Note that you could look at a solar eclipse with a wide-angle or telephoto lens, but the moon would always cover the same area as the sun. (kids, don't try this at home :-)" This is the answer for the problem that I am trying to solve. I received answers for other problems, and from them I learned alot. Alas, I fell prey to curse of the over-educated, looking for a hard answer to a simple question. I had considered similiar triangles, but dismissed them as being too simple. Surely the focal length of the eye came into play somewhere! Until my next major brain failure, Benjamin Ellsworth ben%hpcvlx@hplabs.hp.com or { backbone }!hplabs!hpcvlx!ben