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actual exposure acute angle altitude axis becomes blind shutter blur due bright sunlight calculated central shutter CHAPTER circle of confusion cone conjugate foci consider denote depth of field depth of focus determined diameter diaphragm aperture dimensions direction distant object double blind duration effective exposure efficiency enlargement equal Equation evident example exposure required exposures given focal distance focal length focal plane shutter focus for infinity following Table formula give given values greater hand camera hour hour angle hyperfocal distance inches increase initial area Intensity of illumination L,et lateral shutter latitude law of conjugate lens is focussed lenses meridian altitude method motion necessary node of emergence object distance objects moving permissible photographer position posure practical proportional prussiate of Potash pyro rapid plate rays sharp image short focus shows similar triangles single blind slot slow plate small lens stop treatise vary velocity view angle whilst yards
Page 20 - Over his relics was raised a thupa one league in height, each brick of which was worth one crore. It is said* that there was a great difference of opinion as to what should be the size of the thupa and of what material it should be constructed ; when these points were finally settled and the work of building had started, the citizens found they had not enough money to complete it. Then an...
Page 28 - The time of exposure is proportional to the square of the focal length of the lens.
Page 12 - In other words, depth of focus is directly proportional to the diameter of the circle of confusion, and inversely proportional to the diameter of the aperture. From eq. (2) we know that C' = rr7- • • • (2) and by similar triangles d 6 D _ d Substituting the value of c
Page 28 - D' : so that the shorter the focal length, the greater will be the depth of field ; all other conditions (viz. 6", «, and 0) remaining the same. With a focussing camera, the values of a and D' should be calculated for the lens in nse, and tabulated in some convenient manner.