- This topic is empty.
Lense f-stop query
-
Hi there
Can some help sod please explain to me – what does the f-stop on a camera lense refer to in simple terms so I can grasp it.
i.e 100mm f/2.8 or 55-200mm 4.5.6I found this def on the web :
The ratio of the focal length of a lens or lens system to the effective diameter of its aperture. Also called f-stop.
Thank you kindly
Joan
That is the maximum aperture of the lens, which works like the iris of your eye. The lower the number, the larger the maximum aperture and the more light the lens can gather. The lens may be capable of going to very small apertures, but its largest aperture is always the listed one.
For info about how max aperture affects a lens, just google it :) Basically, a lens that has a smaller f-number will have a larger aperture, allowing faster shooting in low light, shallower depth of field and faster autofocus in low light. smaller f-number lenses tend to be more expensive, as they are technically more difficult to manufacture, and may be heavier.
Hi – simply – The size of the hole!! I’m sure others may explain it better.
Smaller the whole – less light gets through – slower shutter speed required.
Bigger the hole – more light – faster shutter speeds possible – and a shallow depth of field (blur)smaller the hole – more expensive the lens.
thats my understanding anyway.
ciao
bren
http://www.flickr.com/photos/brencullen/Wow-Thank you for taking the time to explain it all so well
I really appreciate it.
Joan
You must be logged in to reply to this topic.
