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> jiangzhijun wrote:
>>  well,I'd like to put forward a question,"How to Calculate or know
>> the Focal Length of the perspective type Camera in POV-RAY3.6",can
>> anybody be so kind to help me? I am a new user to the POV,Thanks!
>>
> To make a povray camera that produces the same effect as a given
> focal length on a 24x36 real life camera, you need to add the
> following to the camera definition:
>
> angle 2*atan2 (36, 2*f)*180/pi
>
> For a 50mm camera lens, this gives an angle of about 40.

Do you have a formula to set the aperture as well for focal blur? :-)  That
would be useful.

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