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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="http://www.amazon.com/Canon-30D-Digital-18-55mm-3-5-5-6/dp/B000DZFPKC/ref=pd_bbs_sr_3/103-0553374-8138221?ie=UTF8&s=electronics&qid=1180205216&sr=8-3"]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 amazon.com for example, some of them say (body only). What does that mean? [ame="http://www.amazon.com/gp/product/B000DZDTKU/sr/ref=pd_cp_e_0/103-0553374-8138221?ie=UTF8&qid=1180205216&sr=8-3&pf_rd_m=ATVPDKIKX0DER&pf_rd_s=center-41&pf_rd_r=0F69DZFBMF7H08HHH8CZ&pf_rd_t=201&pf_rd_ p=250314001&pf_rd_i=B000DZFPKC"]example[/ame]

    Thank you.



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  3. #3
    JIP
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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.
    "It is horrifying that we have to fight our own government to save the environment."

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    70-200 2.8 VR ED
    Nikon SB800 Speedlite

 

 

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