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Simple Lens Calculator
Posted: Sun Feb 04, 2007 4:58 am
by Baldrick
Nothing special. just a simple calculator to help work out what field of vision you will get or what lens will be needed to gain a particular view on a CCTV or web camera. ( Using 1/4", 1/3" or 1/2 inch CCd camera's.)
Thought somebody might find it usefull.
Download source
Posted: Mon Feb 05, 2007 1:47 pm
by dell_jockey
Hi Baldrick,
what units should I use for the data entry fields?
Posted: Tue Feb 06, 2007 7:24 am
by Baldrick
Sorry for the late answer Dell_Jockey,
I have been working away for the last couple of days.
I am using Metre units for distances.
However, millimetres should always be used for lens sizes with this program.
1 of the odd things about CCTV is that the CCD's are referred to in inches, but the lenses fitted to them are reffered to in mm. ( Here in aus anyway. )
If howerever you use feet as your measurements, it will return distances in feet or if metres are your preffered unit, the results will be returned as metres. It is just a simple relative calculation. Just so long as you don't try to mix different value types.
I have tested with several brands of camera's & lenses which I have set up on varying DVR's & all seems to be quite reasonably accurate.