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Keep Shooting! Photography Assignments (04 Feb 2013)
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Where is my F2.8? I can only go as low as F4, why
It is no problem to ask these questions, i think we went all through those questions.
Aperture is build on little panels in the lens. How more they can open, how lower the number of f/stop you can use.
Like the 18-55 will probably start at 18mm at a aperture of f/3.5. But if you zoom in to 55mm, the aperture will be around f/5.6.
There are lenses on the market which you can't see they zoom in, but they can, but then they can hold their light with the f/stop which can be set to f/4.0 or maybe even f/2.8. There are some prime lenses they go to f/1.2.
I know there is a lense on the market which has f/0.8, but that lens is about $ 15,000
Hope i explained it a bit
On your lens it says what aperture your lens goes to. Say you have the kit lens 18-55 mm. On the lens it might have 3.5 - 5.6 for instance. Your lens will not go to a 2.8. The widest your lens might go is 3.5 at the widest end. Hope this helps.
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