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I need a good lens calculator please!

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I'm getting tired of using my lens wheel and wanna know if there's a good lens calculator somewhere online so I don't have to calculate anything in my head. Any ideas?

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If you want one that gives you actual angles of FOV, try this one: http://www.sweeting.org/mark/lenses/cctv.php


If you want something a little more inclusive, and don't NEED to run it online (ie. something you can install on a desktop or laptop), check out http://www.jvsg.com/cctv-lens-calculator/


Edit: just came across this one, it's a small install, very clean and slick, and FREE:


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