Results 1 to 12 of 12

Thread: wat's focus at infinity?

  1. #1

    Default wat's focus at infinity?

    is it the same as hyperfocal distance?

    so how do i set focus at infinity?
    i saw a thread recently on it but no definitive answer.
    TIA

  2. #2
    Moderator ortega's Avatar
    Join Date
    Nov 2004
    Location
    Singapore, Singapore, Singapor
    Posts
    23,686
    Blog Entries
    7

    Default Re: wat's focus at infinity?

    not the same

    switch to manual focus and turn focus ring to infinity

  3. #3

    Default Re: wat's focus at infinity?

    Quote Originally Posted by ortega View Post
    not the same

    switch to manual focus and turn focus ring to infinity
    i tried that.but in the end, objects that are about 100 meters away are oof.
    so when do we use this technique?

  4. #4
    Moderator ortega's Avatar
    Join Date
    Nov 2004
    Location
    Singapore, Singapore, Singapor
    Posts
    23,686
    Blog Entries
    7

    Default Re: wat's focus at infinity?

    Quote Originally Posted by jeanie View Post
    i tried that.but in the end, objects that are about 100 meters away are oof.
    so when do we use this technique?
    never

  5. #5

    Default Re: wat's focus at infinity?

    Quote Originally Posted by ortega View Post
    never
    so it's useless.
    then hyperfocal is the way to go ya.

  6. #6
    Senior Member yyD70S's Avatar
    Join Date
    Dec 2005
    Location
    Singapore
    Posts
    2,454

    Default Re: wat's focus at infinity?

    About the only time I use this technique -- fireworks display -- with no interesting foreground.

    Quote Originally Posted by jeanie View Post
    i tried that.but in the end, objects that are about 100 meters away are oof.
    so when do we use this technique?

  7. #7

    Default Re: wat's focus at infinity?

    Quote Originally Posted by yyD70S View Post
    About the only time I use this technique -- fireworks display -- with no interesting foreground.
    but that also depends how near u are to the fireworks display?
    if you are about 200-300 meters away, and you focus at infinity, your fireworks will be blur right?


  8. #8
    Moderator ortega's Avatar
    Join Date
    Nov 2004
    Location
    Singapore, Singapore, Singapor
    Posts
    23,686
    Blog Entries
    7

    Default Re: wat's focus at infinity?

    Quote Originally Posted by jeanie View Post
    so it's useless.
    then hyperfocal is the way to go ya.
    not totally useless
    depends on situation

    maybe planes, or other stuff far far away

    but for me, almost never use

  9. #9
    Senior Member yyD70S's Avatar
    Join Date
    Dec 2005
    Location
    Singapore
    Posts
    2,454

    Default Re: wat's focus at infinity?

    Point noted.

    So far, my only experiences with fireworks are distant and with wide-to-normal focal length settings.


    Quote Originally Posted by jeanie View Post
    but that also depends how near u are to the fireworks display?
    if you are about 200-300 meters away, and you focus at infinity, your fireworks will be blur right?


  10. #10
    Member
    Join Date
    Feb 2005
    Location
    Eastern Part
    Posts
    306

    Default Re: wat's focus at infinity?

    Quote Originally Posted by jeanie View Post
    but that also depends how near u are to the fireworks display?
    if you are about 200-300 meters away, and you focus at infinity, your fireworks will be blur right?

    I think for most lens, save the longest zoom, are already at infinity at that distance.

  11. #11
    Senior Member
    Join Date
    Mar 2004
    Location
    Central West
    Posts
    1,952

    Default Re: wat's focus at infinity?

    Do note that with ED glass, the point of infinity focus varies with ambient temperature and may not necessarily be at the infinity marked point on the lens (btw, that is why you can turn the focus past the infinity mark on the lens)

  12. #12
    Member
    Join Date
    May 2004
    Location
    Sydney, Australia
    Posts
    611

    Default Re: wat's focus at infinity?

    Quote Originally Posted by MDZ2 View Post
    I think for most lens, save the longest zoom, are already at infinity at that distance.
    Blurness is not due to focus of infinity. For fireworks you often need to cap your aperture down to f4 instead of wide open aperture in order to ensure sharpness, and hence long exposure times. Use manual operations for night..period. Auto exposure is totally unreliable at night unless synced up to flash.

    And use a damn tripod for goodness sake, regardless on the balance compensation in the lens.
    Last edited by Wisp; 14th December 2006 at 09:36 PM.

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
  •