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What is the difference between f/ and F?
This is probably a really dumb question...I see apertures with both numbers, what (if any) is the difference? Is f/5.6 the same as F5.6?..

Comments (5)

... that we sometimes use the term f/ratio, as it is the ratio of the diameter of the lens to it's focal length.KP.

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Http://www.ahomls.com/photo.htmhttp://www.phillipsphotographer.comVoted Best of the City 2004 by Cincinnati MagazineI don't believe in fate, but I do believe in f/8!.

'No study to date has positively attributed all or part [of the climate change observed to date] to anthropogenic [man-made] causes.' - Deleted passage from peer-approved version of the IPCC Climate Change Report...

Comment #1

Greenhead916 wrote:.

What (if any) is the difference? Is f/5.6 the same as F5.6?.

The same as the difference between "light" and "lite". The correct spelling is f/5.6 (with the f in italics), but many people choose to write F5.6 instead. And only the most pedantic among usthat would include mecare at all. .

By the way, you'll occasionally see 1:5.6 as another variation. This variation is usually found in the markings on lenses. Look at the markings across the bottom of the lens on this G9 picture. The lens is an f/2.8-4.8 lens, and is marked 1:2.8-4.8..

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Comment #2

Greenhead916 wrote:.

This is probably a really dumb question...I see apertures with bothnumbers, what (if any) is the difference? Is f/5.6 the same as F5.6?.

Same thing, no difference..

It is supposedly correctly written f/5.6, with the /, because the number is the ratio of the aperture diameter divided by the focal length. That is, we could also say the diameter of the aperture that lets in the light is the focal length divided by this F number, which is written as f/aperture ratio, so we see f/5.6 to indicate that division.Supposedly....

But, even the lenses that have an aperture ring don't show the / either...

Comment #3

Bit like the RAW v. raw debate methinks?.

Cheers ..

Comment #4

Well, f has been the abbreviation for focal length for a long long time: as in 1/u + 1/v = 1/f but what do I know?.

Regards, David..

Comment #5

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This question was taken from a support group/message board and re-posted here so others can learn from it.

 

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