Re: How could the camera on missiles and smart bombs keep its focus?

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Phil Allison Contact options for registered users 's Avatar (by Gravatar) posted on
March 18, 2005, 6:43 am
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"Sea Squid"
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** The depth of field ( aka depth of focus) of a lens with a small aperture
is very wide  -   even a moderate telephoto lens can, when set to F16 or
higher, be in good focus from a couple of metres to infinity.

Interestingly   -  the depth of field of a lens depends only on the size of
the field of view and the F number.  When the subject is very small ( ie
like a postage stamp) then the depth diminishes to a millimetre or so.



...........     Phil






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