Camera specs are posted on the Surveyor web site:
 
Omnivision OV7725 VGA low-light sensor or OV9655 1.3 megapixel sensor  
AA Format Module (32-pin header - 16 x 2 x 0.1")  
Interchangeable Lens - M12 P=0.5 format (12mm diameter, 0.5mm thread pitch). Standard lens is 3.6mm f2.0 (90-deg), optional 2.2mm f2.5 (120-deg)  
Camera header on production board is 90-degree female (vs straight female header shown in top left photo) - 90-degree expansion connector available to place camera parallel with processor board  
RoHS compliant  
 
 
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You should be able to calculate this from the FOV data and aspect ratio using basic right triangle geometry (45-45-90).
 
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The first question/answer in this thread... read above.
 
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