Page 1 of 2 12 LastLast
Results 1 to 20 of 22

Thread: How to AF 2 objects at both ends?

  1. #1

    Default How to AF 2 objects at both ends?

    Hi...have a very newbie qns to ask. How can i take photos of 2 persons standing at both ends of the frame and the AF is on both?

    Isit by locking AF on the 1st person then AF agn on the 2nd person? I'm not sure if this is the correct way to do it? How do you guys do it?

    Much appreciated yr replies. thx
    5DMk2

  2. #2

    Default Re: How to AF 2 objects at both ends?

    just make sure the dof is enough to cover both person. then af on either one is enough.

  3. #3
    Senior Member Numnumball's Avatar
    Join Date
    Mar 2009
    Location
    Central
    Posts
    13,914

    Default Re: How to AF 2 objects at both ends?

    Stop down to obtain a greater dof and read up on hyper focal distance
    I turned PRO in diaper chg!
    My Flickr|My Son

  4. #4
    Moderator ziploc's Avatar
    Join Date
    Jan 2002
    Location
    Snoopyland
    Posts
    4,577

    Default Re: How to AF 2 objects at both ends?

    You'll need to choose an aperture that has enough DOF to cover the distance between the 2 persons. Where you focus (1st person/2nd person/middle) will determine how much DOF you need. Use this DOF calculator to help you.

  5. #5
    Moderator ortega's Avatar
    Join Date
    Nov 2004
    Location
    Singapore, Singapore, Singapor
    Posts
    23,686
    Blog Entries
    7

    Default Re: How to AF 2 objects at both ends?

    you can also make sure that both persons are on the same focal plane + enough DOF to cover

  6. #6
    Senior Member Override2Zion's Avatar
    Join Date
    Jan 2007
    Location
    Singapore/Bangkok Thailand
    Posts
    2,111

    Default Re: How to AF 2 objects at both ends?

    Technically you can't focus ON both persons at the SAME time UNLESS they are exactly the same distance away from you. You can only adjust the aperture (DOF) to get both to appear as sharp as possible. Hope this helps.
    Last edited by Override2Zion; 29th April 2010 at 12:14 PM.
    Nikon D200/D700/D800 User :)
    [www.PositiveStudioProductions.com]

  7. #7

    Default Re: How to AF 2 objects at both ends?

    Thx so much for all yr replies dudes! So meaning i can just af 1 person, provided they are of same focal plane + enuff dof? I assume u recomm single centre focus right?
    5DMk2

  8. #8
    Moderator Octarine's Avatar
    Join Date
    Jan 2008
    Location
    Pasir Ris
    Posts
    12,422

    Default Re: How to AF 2 objects at both ends?

    Quote Originally Posted by Gerald Lam CK View Post
    Thx so much for all yr replies dudes! So meaning i can just af 1 person, provided they are of same focal plane + enuff dof? I assume u recomm single centre focus right?
    Center focus when the persons are at both sides of the frame?
    Please consult your manual about selecting focus points. Together with read-up about DOF (as already recommended) you should be able to get it.
    EOS

  9. #9

    Default Re: How to AF 2 objects at both ends?

    i mean half press the shutter and af on either of the person first then re-adjust the cam to centre so that can "lock" the af?
    5DMk2

  10. #10
    Moderator ziploc's Avatar
    Join Date
    Jan 2002
    Location
    Snoopyland
    Posts
    4,577

    Default Re: How to AF 2 objects at both ends?

    Quote Originally Posted by Gerald Lam CK View Post
    Thx so much for all yr replies dudes! So meaning i can just af 1 person, provided they are of same focal plane + enuff dof? I assume u recomm single centre focus right?
    Quote Originally Posted by Gerald Lam CK View Post
    i mean half press the shutter and af on either of the person first then re-adjust the cam to centre so that can "lock" the af?
    If the 2 persons are at the same distance from the camera, you just need to focus on one. If they are at different distance, you'll need to ensure enough DOF as I mentioned.

    If you need to know how to focus lock/using the AF points, please read your camera's manual as mentioned by Octarine.

  11. #11
    Senior Member Diavonex's Avatar
    Join Date
    Sep 2008
    Location
    Admiralty
    Posts
    3,641

    Default Re: How to AF 2 objects at both ends?

    There are cameras that will pick out faces and allow you to asign focus priority.

  12. #12
    Senior Member ZerocoolAstra's Avatar
    Join Date
    Mar 2008
    Location
    rainy Singapore
    Posts
    9,522

    Default Re: How to AF 2 objects at both ends?

    Quote Originally Posted by Gerald Lam CK View Post
    i mean half press the shutter and af on either of the person first then re-adjust the cam to centre so that can "lock" the af?
    read this on why focus-recompose can pose a problem.
    Exploring! :)

  13. #13
    Senior Member Override2Zion's Avatar
    Join Date
    Jan 2007
    Location
    Singapore/Bangkok Thailand
    Posts
    2,111

    Default Re: How to AF 2 objects at both ends?

    Quote Originally Posted by ZerocoolAstra View Post
    read this on why focus-recompose can pose a problem.
    One way to solve or minimize the problem would be to compose your frame then use the focus point selector to place the active focus point on any of the 2 subjects.
    Last edited by Override2Zion; 29th April 2010 at 01:06 PM.
    Nikon D200/D700/D800 User :)
    [www.PositiveStudioProductions.com]

  14. #14

    Default Re: How to AF 2 objects at both ends?

    alrite...Thx!
    5DMk2

  15. #15

    Default Re: How to AF 2 objects at both ends?

    er... both subjects stand in almost straight line...
    photographer parallel with the subects...
    select single AF...using either 1 of the subject as the focus point....

    tat should keep both in pretty much in close focus if shooting in f2.8...
    else...bump up ur aperture to f5.6 then kick in more flash...


    *kindly amend me if i'm wrong...
    Last edited by Crappy; 29th April 2010 at 01:50 PM.

  16. #16

    Default Re: How to AF 2 objects at both ends?

    Just curious...will bumping up to f5.6 and more flash helps? U tried it b4?
    5DMk2

  17. #17

    Default Re: How to AF 2 objects at both ends?

    Quote Originally Posted by Gerald Lam CK View Post
    Just curious...will bumping up to f5.6 and more flash helps? U tried it b4?
    he probably thinks that you are shooting indoors.

    therefore, f/5.6 increases depth of field, so both will be more likely to be in focus at the same time.

    flash will be because of lighting limitations, f/5.6 with most handheld speeds indoors will be likely very dark, hence he suggest flash.

    how he read your mind, i dunno.

  18. #18

    Default Re: How to AF 2 objects at both ends?

    Quote Originally Posted by Gerald Lam CK View Post
    Just curious...will bumping up to f5.6 and more flash helps? U tried it b4?
    Quote Originally Posted by night86mare View Post
    he probably thinks that you are shooting indoors.

    therefore, f/5.6 increases depth of field, so both will be more likely to be in focus at the same time.

    flash will be because of lighting limitations, f/5.6 with most handheld speeds indoors will be likely very dark, hence he suggest flash.

    how he read your mind, i dunno.
    lol...1st thing came into my mind for ur question is referring to indoor...

    btw..bro night86mare...u can read me...haha..
    Last edited by Crappy; 29th April 2010 at 08:43 PM.

  19. #19
    Member
    Join Date
    Aug 2008
    Location
    here
    Posts
    1,350

    Default Re: How to AF 2 objects at both ends?

    Get a pns with those clever face-detection thinggies.

  20. #20
    Moderator daredevil123's Avatar
    Join Date
    Oct 2005
    Location
    lil red dot
    Posts
    21,627
    Blog Entries
    1

    Default Re: How to AF 2 objects at both ends?

    Quote Originally Posted by Gerald Lam CK View Post
    Just curious...will bumping up to f5.6 and more flash helps? U tried it b4?
    I am not sure about other brands of flashes. But for Nikon iTTL, the flash metering is separate from the camera metering system and the flash metering system is actually center weighted. So, you might want to use FV lock for this situation, since your subjects are both off center.

    Some good reading material on TTL flash meter:
    http://nikonclspracticalguide.blogsp...ot-ttl-bl.html

    Good reading on how to use FV lock:
    http://nikonclspracticalguide.blogsp...alue-lock.html

Page 1 of 2 12 LastLast

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
  •