Results 1 to 11 of 11

Thread: f8 VS f22? whats the difference?

  1. #1

    Default f8 VS f22? whats the difference?

    I noticed that the camera lens can bring the f-stop to 8
    but the camera enables you to set it to f22 or even higher~~

    does f8 mean the same depth-of-field as f22?
    does the camera lower the sensitivity of the ccd to achieve f22??

  2. #2

    Default Re: f8 VS f22? whats the difference?

    f8 is not the same as f22.
    I'm assuming you are using a DSLR because there is no PnS or prosumer that has f22 aperture settings.

    f22 will give you more depth of field but it will also result in diffraction which softens the final result, assuming that's the min aperture setting.

    I'm not sure what you mean by "the lens can bring the f-stop to 8 but the camera enables you to set it to f22 or even higher."

    The sensor is not involved in any f-stop setting.
    Work: PicasaWeb | Play: Animus3 | Mobile: Tumblr

  3. #3

    Default Re: f8 VS f22? whats the difference?

    hmm think i got mixed up
    cuz usually i see that lenses state the they can go from e.g. 2.8-6.3.
    but i suppose that the can go up to 22~~ or higher

  4. #4

    Default Re: f8 VS f22? whats the difference?

    Quote Originally Posted by Wenjin View Post
    hmm think i got mixed up
    cuz usually i see that lenses state the they can go from e.g. 2.8-6.3.
    but i suppose that the can go up to 22~~ or higher
    No no no. What I'm thinking is that you see the 2.8 - 6.3 is the maximum aperture (or rather, smallest f-stop number) that the lens can go from a certain range.

    i.e. when a lens is 70-300, f/2.8~6.3, it means that maximum aperture at 70mm will be 2.8, and at 300mm will be 6.3.

    But anyways, f/8 and f/22 - f/22 will definitely give you a lot more DOF, but more often than not this is not discernible or evident if you're shooting landscapes - more evident when you're shooting stuff like macro.

  5. #5

    Default Re: f8 VS f22? whats the difference?

    Quote Originally Posted by Wenjin View Post
    hmm think i got mixed up
    cuz usually i see that lenses state the they can go from e.g. 2.8-6.3.
    but i suppose that the can go up to 22~~ or higher
    Usually we say go down to F/22 because it's 1/22 = openning/focal length, meaning only a small hole is open for light.

    The F/2.8-6.3 is likely the maximum aperture range at the wide and tele end of a zoom lens, meaning 1/2.8 max at wide angle, 1/6.3 max at telephoto.

    ==editted==

    night86mare you're quick ~

    To add one more point - normally beyond F/11 defraction starts to set in so don't close it down too much unless you really need the DOF badly.
    Last edited by grantyale; 4th June 2007 at 11:10 PM.

  6. #6

    Default Re: f8 VS f22? whats the difference?

    What is stated on the lens is the maximum aperture that the lens is limited to at a particular zoom length.

    At the widest, it is 2.8
    At max telephoto zoom, it is 6.3

    typically, lenses of 35mm cameras will stop at f22 though there are exceptions
    Work: PicasaWeb | Play: Animus3 | Mobile: Tumblr

  7. #7

    Default Re: f8 VS f22? whats the difference?

    Quote Originally Posted by grantyale View Post
    To add one more point - normally beyond F/11 defraction starts to set in so don't close it down too much unless you really need the DOF badly.
    Also to add on, sometimes you stop down to do stuff like.. Smooth out waves for that blurry smoothed out effect.

    That is when you cannot afford ND filters, of course.. =) But in any case, I think the resultant image degradation from ND filters will be almost the same as diffraction effect, so it's not much loss, though I could be wrong. =D

  8. #8
    Member
    Join Date
    Mar 2002
    Location
    north
    Posts
    1,310

    Default Re: f8 VS f22? whats the difference?

    Quote Originally Posted by Wenjin View Post
    hmm think i got mixed up
    cuz usually i see that lenses state the they can go from e.g. 2.8-6.3.
    but i suppose that the can go up to 22~~ or higher
    what you are looking at must be a zoom lens. some zoom lens have a constant max aperture...say 2.8 meaining when you zoom say from 28 -70mm the max aperture is still 2.8

    most cheaper zoom lens do not have a fixed but a variable aperture. say a 28-70/3.5-5.6 it means at 28mm the largest available aperture is 3.5, when you zoom the lens, the largest aperture also changes and at 70mm, you will get 5.6 and nothing lower that that.

    think of it like fast cars...a 2.8 constant is like a fast car that can hit 200km/h, but that doesnt mean it can go slow at 50km/h

    whereas 5.6 is a slower car, it can go 100km/h or slower but can never reach that of a 2.8.

  9. #9

    Default Re: f8 VS f22? whats the difference?

    Quote Originally Posted by night86mare View Post
    No no no. What I'm thinking is that you see the 2.8 - 6.3 is the maximum aperture (or rather, smallest f-stop number) that the lens can go from a certain range.

    i.e. when a lens is 70-300, f/2.8~6.3, it means that maximum aperture at 70mm will be 2.8, and at 300mm will be 6.3.

    But anyways, f/8 and f/22 - f/22 will definitely give you a lot more DOF, but more often than not this is not discernible or evident if you're shooting landscapes - more evident when you're shooting stuff like macro.
    ya lor...shoot spider sometime f32 also not enough

  10. #10
    Senior Member zac08's Avatar
    Join Date
    Feb 2005
    Location
    East
    Posts
    11,755

    Default Re: f8 VS f22? whats the difference?

    Quote Originally Posted by ihub88 View Post
    ya lor...shoot spider sometime f32 also not enough
    Tat brings me to a point... What is the minimum aperture that a lens is capable of?

    I just tried my Tamron macro and it allows me to take it down to f64 when the lens aperture ring only shows up to f32.

  11. #11
    Senior Member
    Join Date
    Aug 2005
    Location
    Tanjong Katong
    Posts
    3,710

    Default Re: f8 VS f22? whats the difference?

    Quote Originally Posted by zac08 View Post
    Tat brings me to a point... What is the minimum aperture that a lens is capable of?

    I just tried my Tamron macro and it allows me to take it down to f64 when the lens aperture ring only shows up to f32.
    Macro lens is different. It is the design of macro lens you will lose the stop. At minimum distance (macro distance), the aperture will stop down (1 or 2 stop IIRC, depend on what macro lens) from aperture it can achieve in long distance.

    Regards,
    Arto.

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
  •