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  1. #1
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    What does that f-number mean in camera specs?

    When I see a camera on a website, under the specs (or sometimes in the name) it says something like [this is from [ame=""]here[/ame]] "Canon EOS 30D 8.2MP Digital SLR Camera Kit with EF-S 18-55mm f/3.5-5.6 Lens". What does 18-55mm mean and what does that f/number mean?

    If possible, could give give examples of what happens when those numbers are changed (eg: if the mm increases, the lens is finer and probably more expensive [that's just a guess], or if the f/number is decreased the image is brighter or whatever)?

    Secondly, when I see a camera on for example, some of them say (body only). What does that mean? [ame=" p=250314001&pf_rd_i=B000DZFPKC"]example[/ame]

    Thank you.

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  3. #3
    JIP is offline
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    The 18-55 number is the focal length of the lens ex. 18 means a very wide lens and 200 would be a long zoom lens so it would bring things in closer. The F number is the maximum aperture of the lens and a measurement of the lenses light gathering capabilities and is a good way to judge the quality of the lens meaning a lens with a max. aperture of 2.8 is going to be better than the lens you listed. And yes "body only" means no lens.
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