Back button focus

Discussion in 'Photography Beginners' Forum' started by mamatomaya, Jul 14, 2010.

  1. mamatomaya

    mamatomaya TPF Noob!

    Joined:
    Jul 10, 2010
    Messages:
    34
    Likes Received:
    0
    Location:
    Nashville
    Can others edit my Photos:
    Photos OK to edit
    Hi all,
    I'm still working on figuring out the best way to make sure I get sharp photos and don't miss focus. Someone suggested back button focus. I want to try it out and I figured out how to change the custom function to switch it, but I thought it would make it so that pushing that one button would change the focus point, but didn't. I find it difficult to change the focus point while looking through the view finder. Any help or resources on this? TIA!
     
  2. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

    Joined:
    Dec 16, 2003
    Messages:
    33,817
    Likes Received:
    1,811
    Location:
    Edmonton
    Can others edit my Photos:
    Photos NOT OK to edit
    Rather than change the focus point, try using just the centre point.

    Aim the camera at your subject (say a person). Use the back button to activate the focus and focus on their eyes. Then release the focus button (essentially locking the focus) and recompose the shot to how you want it....then fire away.
     
  3. Derrel

    Derrel Mr. Rain Cloud

    Joined:
    Jul 23, 2009
    Messages:
    35,456
    Likes Received:
    12,794
    Location:
    USA
    Can others edit my Photos:
    Photos OK to edit
    Yes, there are some resources on this subject. SInce you are referring to "back button focus", I assume you are a Canon shooter. The Canonb, USA web site has a nice article on back button focusing at Canon Digital Learning Center - Back-Button Auto Focus Explained

    The article is entitled, "Back-Button Autofocus Explained". Please keep in mind that the newer Canon bodies possess an AF-ON button, which I "think" was introduced on the EOS 30D, but maybe it was the 40D--I cannot recall which body. On other,and arlier Canons ion the 10D-20D series, there is NOT an AF-ON button, and the "*" button is used instead, so there are some major differences in how back button focusing is achieved/done, depending on the Canon camera one owns.
     
  4. redtippmann

    redtippmann TPF Noob!

    Joined:
    Aug 19, 2008
    Messages:
    706
    Likes Received:
    6
    Location:
    Athens, Ohio
    Can others edit my Photos:
    Photos NOT OK to edit
    I personally LOVE to use BBF! At first I wondered why anyone would want to use it, and it felt so odd. But after shooting 2 baseball games with it I really like the way I can work with the camera now.
     
  5. icassell

    icassell TPF Noob!

    Joined:
    Jun 7, 2008
    Messages:
    9,893
    Likes Received:
    10
    Location:
    Arizona
    Can others edit my Photos:
    Photos NOT OK to edit
    Switching to BBF has increased significantly my keepers. I couldn't imagine using the 'half press' method anymore.
     
  6. peanut170

    peanut170 TPF Noob!

    Joined:
    Jun 20, 2010
    Messages:
    289
    Likes Received:
    2
    Location:
    Vancouver, Washington
    Can others edit my Photos:
    Photos OK to edit
    What is this back button that you speak of? I have a nikon is it called something else?
     
  7. redtippmann

    redtippmann TPF Noob!

    Joined:
    Aug 19, 2008
    Messages:
    706
    Likes Received:
    6
    Location:
    Athens, Ohio
    Can others edit my Photos:
    Photos NOT OK to edit
    Its the AF-ON button

    If you go to your CSM menu-> and go to AF activation -> AF-On only

    So now it will only focus when you press that button.
     
  8. kami

    kami TPF Noob!

    Joined:
    Feb 24, 2008
    Messages:
    153
    Likes Received:
    0
    Location:
    Texas
    Can others edit my Photos:
    Photos OK to edit
    Interesting. What benefits have you found useful as compared to the half-press method? Right off the bat, I can see having more tactile control of the camera so you don't accidentally fully press the shutter in certain situations. But I don't have experience with this.
     
  9. icassell

    icassell TPF Noob!

    Joined:
    Jun 7, 2008
    Messages:
    9,893
    Likes Received:
    10
    Location:
    Arizona
    Can others edit my Photos:
    Photos NOT OK to edit
    You get your focus right ... then you can move the camera to put the object in-focus elsewhere in the field and, as you say, you don't accidentally push the shutter release.
     
  10. Overread

    Overread has a hat around here somewhere Staff Member Supporting Member

    Joined:
    May 1, 2008
    Messages:
    23,085
    Likes Received:
    3,754
    Location:
    UK - England
    Can others edit my Photos:
    Photos OK to edit
    Remember though that moving the camera away from the focused point to recompose the shot with this method can result in you missing the focus. That is because the depth of field is effectivily like a flat sheet parallel to your lens front and focused over the point of focus - however if you change the angle that you are shooting at you risk moving that "bit of paper" to a position where its no longer covering the subject you focused on.
    For that reason I tend to prefer to use with method with USM/HSM focusing lenses - so that I have all the time manual focus on the lens to make any minor focus corrections if needed.
     
  11. icassell

    icassell TPF Noob!

    Joined:
    Jun 7, 2008
    Messages:
    9,893
    Likes Received:
    10
    Location:
    Arizona
    Can others edit my Photos:
    Photos NOT OK to edit
    Good point! This is especially important when shooting at maximum aperture.
     
  12. mamatomaya

    mamatomaya TPF Noob!

    Joined:
    Jul 10, 2010
    Messages:
    34
    Likes Received:
    0
    Location:
    Nashville
    Can others edit my Photos:
    Photos OK to edit

    Ah, I figured it out. Wow! Can't believe everyone doesn't use this all the time. So much easier!
     

Share This Page

Search tags for this page

back button focus 7d

,
back button focus on canon 30d
,

beginner to back button focus

,
can't get sharp images with back button focus on the canon 7d
,

canon 10d back button focus

,

canon 7d/back button focusing

,
how to find back button focus on canon xsi
,
not getting sharper images with back button focusing
,

sharp photos back button focus

,
uitleg gebruik back button focus