Buying a lens

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#155

From: Mark Robinson (JO PhD)
Date: Wed, 22 Jul 1992 08:56

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Hi.

Quick question about lenses. I want to buy a fixed focus lens
(fixed focus == less glass == lower distortion ?). I would
like an object about 15mm diameter to fill an image with the
object - camera distance somewhere between 40 and 70cm.

How do I calculate the focal length of the lens?

Cheers
Mark
mark-r@snow_white.ee.man.ac.uk

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Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!uknet!mucs!spec0.ee.man.ac.uk
From: mark-r@spec0.ee.man.ac.uk (Mark Robinson (JO PhD))
Newsgroups: sci.image.processing
Subject: Buying a lens
Message-ID: <5435@m1.cs.man.ac.uk>
Date: 22 Jul 92 08:56:19 GMT
Sender: news@cs.man.ac.uk
Organization: Dept Electrical and Electronic Eng, Manchester University, UK
Lines: 12