focal length

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  • noun

Synonyms for focal length

the distance from a lens to its focus

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References in periodicals archive ?
u UltraA[degrees]telephoto lens with classA[degrees]leading focal length
The results can use to calculate the focal length of molded microlens by optical formula.
There is the problem of lateral chromatic aberration due to the wedge at the outer rim of the objective lens, but this has been reduced to a minimum by having a very long focal length.
A focal length of 50mm produces a picture on 35mm film where the perspective will look normal.
The focal length of each lens was determined using the 'hanging drop' method described in Homann (1928) and Land (1985).
Both have a 3:2 aspect sensor that makes full use of 35mm-format SLR lenses without a focal length factor.
On-location news coverage can frequently involve rapid changes in subject distance and associated focal length.
This lens is a 50mm (35 mm camera equivalent) single focal length lens with a large diameter.
To obtain useful magnification, say x5, his lens would have needed a focal length five times as great.
The expansion alters the lens' focal length and diminishes transmitted light, Lyon says.
The C22X23 reaches a focal length of 500 mm with a range of 23 mm to 506 mm.
Pertinent Data: The laser's focal length automatically adjusts to both ferrous and non-ferrous materials of varying thickness.
Three glass mold aspherical lenses provide excellent correction for distortion, color aberration and field curvature, and an inner focusing system corrects the fluctuation of aberration to maintain image quality regardless of the focal length.
44 fixed focal length cameras record clear footage up to a distance of 100 metres.
This compact lens with one-to-one magnification in a normal focal length features high-grade aluminum construction of the lens barrel, hood, and cap.