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Re: SLR LENS SPECIFICATION

Posted by cc on August 26, 2002 at 13:45:40:
In Reply to: SLR LENS SPECIFICATION posted by Nila on August 22, 2001 at 10:19:34:

: What is the meaning of the specification 1:2.8 or 1:1.4 mentioned on the SLR camera lens.

There are 3 common specs. the first is the focal length such as 28mm, 50mm etc.

Onother common specification indicates the largest aperture setting at which this lens functions. The size of the aperture is indicated by its f-number, i.e., the ratio of the diameter of the opening to the focal length of the lens; a large aperture is indicated by a small numerical f-number.

Another specification shows the ratio of photo image to actual item size that the lens may be used to generate. So 1:1.4 means that the lens can create an image that is almost life size (for very small items obviously) on the film or slide.

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: : What is the meaning of the specification 1:2.8 or 1:1.4 mentioned on the SLR camera lens. : There are 3 common specs. the first is the focal length such as 28mm, 50mm etc. : Onother common specification indicates the largest aperture setting at which this lens functions. The size of the aperture is indicated by its f-number, i.e., the ratio of the diameter of the opening to the focal length of the lens; a large aperture is indicated by a small numerical f-number. : Another specification shows the ratio of photo image to actual item size that the lens may be used to generate. So 1:1.4 means that the lens can create an image that is almost life size (for very small items obviously) on the film or slide.

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