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StewartR submitted a new resource:
How big a lens do I need? - How big a lens do I need?
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How big a lens do I need? - How big a lens do I need?
(Mods: I'm hoping this might be suitable material for the Tutorials section.)
In my line of business I often get people asking how big a lens (ie what focal length) they'll need for a specfic task. It's actually quite easy to work out if you know - or can estimate - how big the subject is, and how far away it will be. Here's how.
The basic equation is:
Focal Length = 0.75 x Sensor Size x Subject Distance / Subject Size
Here are some examples. In each case I'm...
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