The Photographic News: A Weekly Record of the Progress of Photography, Volume 48Cassell, Petter, and Galpin, 1904 |
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Page 76
... focus in an image when viewed on the ground glass by means of a magnifying glass . It had also been found that , when the focus improved in one part of the screen , it deteriorated in another . Recent research showed that the good focus ...
... focus in an image when viewed on the ground glass by means of a magnifying glass . It had also been found that , when the focus improved in one part of the screen , it deteriorated in another . Recent research showed that the good focus ...
Page 127
... focus supplementary lenses to get in order to obtain , with the same lens , 5 in . focus , also 22 in . focus - in other words , half and double focus ? IQUIQUE . The formula is : f = FX a ÷ F + a , in which ƒ = the required focus , F ...
... focus supplementary lenses to get in order to obtain , with the same lens , 5 in . focus , also 22 in . focus - in other words , half and double focus ? IQUIQUE . The formula is : f = FX a ÷ F + a , in which ƒ = the required focus , F ...
Page 297
... focus can have any better depth of focus than any other lens of the same size and focus . Very small lenses of very short focus produce , naturally , cones of light of such small area that the differences in their conjugate focii are so ...
... focus can have any better depth of focus than any other lens of the same size and focus . Very small lenses of very short focus produce , naturally , cones of light of such small area that the differences in their conjugate focii are so ...
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