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  1. willkia

    willkia

    Messages:
    49
    Name:
    Will
    Edit My Images:
    Yes
    Hi guys,

    I have a Canon 70D

    Last weekend I went out shooting for the first time. I shot some friends in their new clothing brand.

    Half my pictures were in focus and half weren’t

    And I don’t know why!

    Maybe because I was snapping too quick and not half pressing the shutter?


    When shooting a single model what AF point setting should I use?

    Also, when shooting a group of people, say 3 people stood next to each other. How do I get them all in focus but using an F stop of 1.8.

    Which AF point should I use?


    I don’t use manual. Not really learnt yet.

    I use AV

    thanks guys
     
  2. AgentOrange76

    AgentOrange76

    Messages:
    55
    Name:
    James
    Edit My Images:
    Yes
    someone far more experienced than me will be along shortly im sure and will correct me if i go a little wrong.

    F1.8 has a narrow depth of field so will only have a small range where the point of focus is sharp in focus. Unless its low light i would suggest using a larger aperture (f Stop). I have recently realised the mistake of trying to use the lowest f stop and alot of the time its not needed. Did you try using a higher F stop say 5.6?
     
  3. willkia

    willkia

    Messages:
    49
    Name:
    Will
    Edit My Images:
    Yes
    Thanks for the reply. But I want the subjects in focus and a really blurred background. That’s why I want to use 1.8
     
  4. rick448

    rick448

    Messages:
    823
    Name:
    Rick
    Edit My Images:
    No
    Unless they are all the same distance from you (focal plane) then you won't be able to do that. At 1.8, you will have a shallow depth of field, especially if using a telephoto lens, less narrow with a more wide angle. By choosing a larger F stop number, and therefore smaller aperture, your depth of field will increase.

    Pick the focus point on the area you want to be sharp, anything on that focal plane will be sharp, but you can't focus in more than one focal plane at once, regardless how many points you choose.

    If some shots were blurred, it could be your shutter speed was too slow, and you had either camera shake, or subject movement.
     
    Peter Dransfield likes this.
  5. Harlequin565

    Harlequin565

    Messages:
    2,576
    Name:
    Ian
    Edit My Images:
    No
    Depth of field depends on aperture, focal length and distance to subject. Only knowing 1 of those isn't much help. But if you plug that information into this site, you can see how much depth of field you had and work out whether you were making things difficult for yourself. As an example, 50mm on a crop sensor at f1.8 & subject distance of 2m = 10cm depth of field (1.95m - 2.05m) which is quite shallow. However if they were at 4m, the depth of field jumps to 40cm (3.8 - 4.2m) which is much more forgiving

    It sounds to me like you were in a big rush if you're not even sure the half press was working! Blur can be cause by missed focus, subject movement and photographer movement so it's not necessarily missed focus to blame. Could be one of, or a combination of, many things.
     
  6. willkia

    willkia

    Messages:
    49
    Name:
    Will
    Edit My Images:
    Yes
    I have a sigma 18-35mm 1.8 lens


    And the subjects will be about 1-3 meters from me
     
  7. Snapper67

    Snapper67

    Messages:
    207
    Name:
    Dougie
    Edit My Images:
    Yes
    f1.8 ain't going to work for that.

    Have the subjects as far as you can from the background and test from 2.8 upwards.
     
    Last edited: Apr 13, 2018
  8. rick448

    rick448

    Messages:
    823
    Name:
    Rick
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    No
    What shutter speed were you using, and what are the subjects doing? Also, what focal length are you using? The link in Ian's post will help you with this too.
     
  9. wave01

    wave01

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    1,316
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    Post some pictures with exit data it will help us to see the problem
     
  10. Box Brownie

    Box Brownie

    Messages:
    5,017
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    No
    As has been pointed out, you need to control the subjects positioning and the choice of aperture to ensure that all of them are within the focus zone covered by the DoF for that focal length for the distance from camera and distance from the background.

    To simple state what you want to have, as you have discovered is not always possible..........................as Scotty said to Jim, "I canna do it Captain, it defies the laws of physics................"

    Run your own tests to prove it to yourself :)
     
  11. Phil V

    Phil V

    Messages:
    20,660
    Name:
    Phil
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    Try back button focussing, relax and be one with the camera. Play with your camera constantly till using it is 2nd nature, like driving.

    Whichever is most suitable, once your technique is solid, it’ll be unimportant.

    You’ll need them stood in exactly the same plane, otherwise a higher f stop to give you enough DoF, check a DoF calculator, keep the subject to bg as large as you can.

    Unimportant, but it is important to understand when your camera meter will get it wrong, use exp lock or exp comp, then you’ll know when shooting in M makes more sense (sometimes but not often)

    I’m sorry I can’t comment without asking why you took on what sounds like a ‘job’ when you’re clearly not ready.
     
  12. DemiLion

    DemiLion

    Messages:
    11,251
    Name:
    Mark
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    No
    ^That x100
     
  13. adrianday

    adrianday

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    606
    Name:
    Adrian
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    No
    Send nudes. ;)
     
  14. jamesev

    jamesev

    Messages:
    484
    Name:
    Jamesev
    Edit My Images:
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    Or use f4. Just because you have a f1.8 lens doesn't mean you're limited to F1.8. Dial in F4 at the same settings and the DOF increases to 25 cm. Still enough to blur the infront of and behind of (if whats behind is about 1 m behind.
     
  15. willkia

    willkia

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    49
    Name:
    Will
    Edit My Images:
    Yes
    I was just helping some friends out. Free of charge. They were really happy with all the pics that were in focus.

    I was just annoyed with the ones that were out of focus and didn’t know why
     
  16. Shaun Palmer

    Shaun Palmer

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    417
    Name:
    Shaun
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    Yes
    Putting a few of the OOF shots up might help, one problem could potentially be that, if you we're using the auto focus point selection that it was picking the wrong point to focus on.
    I never use AF point selection in auto mode for this reason
     
  17. willkia

    willkia

    Messages:
    49
    Name:
    Will
    Edit My Images:
    Yes

    Which setting do you reccomend I use?
     
  18. Shaun Palmer

    Shaun Palmer

    Messages:
    417
    Name:
    Shaun
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    Just select the focus point manually, there should be a quick access button for it on the back of the camera somewhere
     
  19. Phil V

    Phil V

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    20,660
    Name:
    Phil
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    Then read the rest of my post. ;)

    Asking what others do won’t help, finding what works for you is the only way. There’s no shortcuts, it just takes practice.
     
    Shaun Palmer likes this.
  20. Shaun Palmer

    Shaun Palmer

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    417
    Name:
    Shaun
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    Yes
    :agree:
     
  21. Phil V

    Phil V

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    20,660
    Name:
    Phil
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    I’m honestly not having a personal dig, this is about the state of the industry, not about you and your mates.

    Off course they were ‘happy’, they got free pictures, and have no concept of how much better the images would have been if they’d paid for a pro to produce them.

    And if they have the same attitude to marketing generally, they’ll never realise why their business didn’t do 10x better.
     
    Bristolian and adrianday like this.

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