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length
(redirected from focal length)

    Also found in: Dictionary/thesaurus, Medical, Acronyms, Encyclopedia, Wikipedia 0.03 sec.
length noun breadth, continuance, dimension, distance lengthwise, elongation, expanse, expansion, extensiveness, extent, lengthiness, limit, long-windedness, magnitude, measure, measurement, proportion, range, reach, size, span, stretch
Associated concepts: length of memoranda of law, term limit
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One would expect that reducing the focal length of the objective lens in this manner would reduce the distance between the red and blue focus as a proportion of the cut off or remaining focal length of the objective lens over the short focus of the reducer, but not so
Discovery of a new refractor system by Wall, John / Journal of the British Astronomical Association
A medium focal length lens for this type of image is perfect - anything between 35mm to 100mm and the use of a small aperture will ensure that everything from the front to the back of the image is in sharp focus.
PHOTOGRAPHIC TUTORIAL FROM COLIN PRIOR; CLOSE-UPS by Daily Record (Glasgow, Scotland)
Focal Length Multiplier--Many digital SLRs have sensors smaller than the sensitive area of 35mm film.
A photographer's glossary by Ashbrook, Stan; Drury, Fred / PSA Journal
 
 
 
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