Results 1 to 9 of 9

Thread: F number and aperture?

  1. #1

    Default F number and aperture?

    hey guys, i'm wondering whats the relation between the two? i'm a noob, so i have hardly any idea about their relationships.. it seems like the numbers are kinda close, and some threads which i've read said something about the max and min of the F number limits the the size of the aperture.. is that true?

    i'm thinking of getting the sony h-7, and its F number is 2.7-4.5, with aperture of 2.7-8.. so does this mean the limit of aperture is til 4.5 instead of 8?

  2. #2

    Default Re: F number and aperture?

    they pretty much refer to the same thing. for the h7, the first set of numbers represent the widest aperture in the widest end of the lens and the tele end of the lens. the 8 refers to the smallest aperture on the tele end.

  3. #3

    Default Re: F number and aperture?

    when you shoot wide angle, the largest aperture you can select is 2.7.

    when you shoot telephoto, the largest aperture you can select is 4.5.

  4. #4

    Default Re: F number and aperture?

    Quote Originally Posted by schizer View Post
    hey guys, i'm wondering whats the relation between the two? i'm a noob, so i have hardly any idea about their relationships.. it seems like the numbers are kinda close, and some threads which i've read said something about the max and min of the F number limits the the size of the aperture.. is that true?

    i'm thinking of getting the sony h-7, and its F number is 2.7-4.5, with aperture of 2.7-8.. so does this mean the limit of aperture is til 4.5 instead of 8?
    The largest aperture is f/2.7 at the wide end and the largest aperture at the tele end is f/4.5. The smallest aperture which the camera can stop down to is f/8 (same for most PnS with small sensors because of diffraction limits due to the small pixel dimension).
    Last edited by lsisaxon; 13th February 2008 at 01:57 PM.

  5. #5

    Default Re: F number and aperture?

    meanin to say the range is 2.7-8 f/stop

    if i were to use it wo shoot wide picture, then i can use frm 2.7-8f/stop

    but if i push the zoom to max, i will b oly able to shoot from 4.5-8f/stop right?

  6. #6

    Default Re: F number and aperture?

    Quote Originally Posted by compro_1975 View Post
    meanin to say the range is 2.7-8 f/stop

    if i were to use it wo shoot wide picture, then i can use frm 2.7-8f/stop

    but if i push the zoom to max, i will b oly able to shoot from 4.5-8f/stop right?
    Yes... The correct way to write is f/2.7-f/8 and f/4.5-f/8.
    Last edited by lsisaxon; 15th February 2008 at 04:55 PM.

  7. #7

    Default Re: F number and aperture?

    Aperture refers to the physical object (the almost circular part) of your camera. F-stop is the unit to measure it.

    Meaning.... just like a Ruler and CM...what's the relation? Ruler is an object. CM is the unit.

  8. #8

    Default Re: F number and aperture?

    lsisaxon tks to all the reply you had given me, i would want to draw your attention to this: http://www.tamron.com/assets/vs2/pdfs/a20.pdf the last page, i see the similar situation, it stated max aperture F/3.5-6.3 below it, it states Minimum Aperture F/22~F/40 (28mm~300mm), it is of the same prinple that at 28, i my fastest lens is 3.5 and at 300, my fastest is 6.3?

  9. #9

    Default Re: F number and aperture?

    Quote Originally Posted by compro_1975 View Post
    lsisaxon tks to all the reply you had given me, i would want to draw your attention to this: http://www.tamron.com/assets/vs2/pdfs/a20.pdf the last page, i see the similar situation, it stated max aperture F/3.5-6.3 below it, it states Minimum Aperture F/22~F/40 (28mm~300mm), it is of the same prinple that at 28, i my fastest lens is 3.5 and at 300, my fastest is 6.3?
    right

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •