In the last two videos we learned how to use pixels and camera placement to calculate our Fields of Fire. Now we're going to use the power of lenses to focus this protection. A cameras' job is to gather a portion of light, measure the correct amount with an iris and pass it through a lense that focuses onto a CCD. This iris is like our own and the CCD like our retina. GATHER & CLEAN - We gather and shape the light down a gauntlet of concave and convex lenses called 'elements' that are protectively coated to deflect damaging rays...just like sunscreen. MEASURE DOSAGE - Now that the light has been gathered, cleaned and shaped it is steered through the iris to calibrate the correct dosage. FOCUS - This perfect dosage of clean light now travels a distance called 'Focal Length' from the focusing lense to the CCD. This distance is VERY important as it combines with the iris to precisely define the cameras' area of coverage and depth of view. Most cameras have a FIXED focal length that is measured in millimeters and but offer limited coverage. VariFocal lenses are the best choice for unique areas and changing conditions as they offer precise adjustment. Now, our cameras will be on the criminal like a dog on a bone.
Recommend : !: Lcd Plasma Tv This Instant Shop For Nikon Dslr Cameras Focusing Lense Immediately
0 comments:
Post a Comment