Howdy Doody

J

Joopy

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jo hooper
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Howdy Doody Jo here from sunny Newport. Run a eos 550d final year of my btec and still trying to find out what f means in f.stop:shrug:

Looking forward to learning loads on here.
 
Hi Jo, and welcome to TalkPhotography.

By the way, I'm not sure what the conventions are in Newport, but normally when someone takes the time to pass on information to you, it's generally considered common courtesy to to reply and thank them...
 
TheBigYin said:
Hi Jo, and welcome to TalkPhotography.

By the way, I'm not sure what the conventions are in Newport, but normally when someone takes the time to pass on information to you, it's generally considered common courtesy to to reply and thank them...
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A little harsh there Mark, if I may say so.

I remember being Jo's age myself and the first time I saw the word "Fractional" in print, it floored me. I locked myself in my bedroom and wouldn't speak to anyone for days.

Jo,
On the off chance that you manage to successfully reboot your "courtesy module", then I wish you a hearty welcome to our growing little community.

Bob
 
Joopy said:
Howdy Doody Jo here from sunny Newport. Run a eos 550d final year of my btec and still trying to find out what f means in f.stop:shrug:

Looking forward to learning loads on here.
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The actual origin of the 'f' in f-stop...

Well there are a couple of theories ....

(1) It's derived from a French word beginning with f which basically means a window.

(2) The f was assigned to aperture sizes by very early photographers who are no longer with us so we can't really ask them. The generally accepted (and the most likely) explanation is that the 'f' signifies that the aperture number is arrived at by dividing the physical width of the diameter of the aperture into the focal length of the lens.

A max aperture measuring 25mm on a 50mm lens would therefore be an f/2 lens. If it measured 50mm then you'd have an f/1 lens.

So the f signifies that the aperture size is related to the focal length of the lens.
 
CT said:
(2) The f was assigned to aperture sizes by very early photographers who are no longer with us so we can't really ask them. The generally accepted (and the most likely) explanation is that the 'f' signifies that the aperture number is arrived at by dividing the physical width of the diameter of the aperture into the focal length of the lens.

A max aperture measuring 25mm on a 50mm lens would therefore be an f/2 lens. If it measured 50mm then you'd have an f/1 lens.

So the f signifies that the aperture size is related to the focal length of the lens.
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Hi CT

I did have that in my original post but edited as I thought it may be hard to understand well it would the way I wrote it, not as clearly as you have explained it

I understood its also known as fractional
 
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