calibration

Discussion in 'Canon Lenses' started by Evertking, Aug 15, 2019.

  1. Evertking

    Evertking How do I turn this thing on? Supporting Member

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    Is it necessary to calibrate all lenses?
    I was shooting today and wanted to practice shooting wide open (1.2-2) but man, I got maybe one photo out of 10 in focus.
    Should I try and calibrate or do I just suck and need more practice?


     
  2. zombiesniper

    zombiesniper Furtographer Extraordinaire! Supporting Member

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    I always calibrate all of my lenses......I should actually say I always check my lenses and calibrate if needed.
    There is no point spending money on something that isn't performing at it's best. Plus, it's free added image quality.

    Edit: You will still need more practice though. We all do.
     
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  3. Evertking

    Evertking How do I turn this thing on? Supporting Member

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    Last night I set up a few bottles in a line and had my camera on a tripod and at 1.2 it nailed focus every time so I'm guessing it is a combination of the subject moving and myself.
    I done some searching on calibration but from your experience what do you think works best.
    thanks for the help
     
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  4. RVT1K

    RVT1K No longer a newbie, moving up!

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    Can you elaborate a little, please?
    I don't think I understand what is meant by calibrating the lens. Is this something actually done to the lens itself or a focus fine-tuning in the body when the particular lens is used?

    Thanks in advance.
     
  5. smoke665

    smoke665 TPF Supporters Supporting Member

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    B&H has a good article on testing and a full resolution test target you can download How to Test Your Lens
     
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  6. zombiesniper

    zombiesniper Furtographer Extraordinaire! Supporting Member

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    I mean micro focus adjust my camera body for each lens.
     
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  7. Derrel

    Derrel Mr. Rain Cloud

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    My calibration routine is simple. I take a long strip of silver duct tape and put it on the outside of the building and every 1/2 inch I draw a line with the black sharpie pen. I use a yardstick to measure and mark the distances in inches and feet. I shoot from roughly 10 feet away at a 45° angle,from a tripod. This makes a really good and yet easy to acquire focus target. I do these tests in JPEG mode.
     
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  8. RVT1K

    RVT1K No longer a newbie, moving up!

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    Thanks for the input, guys. Time to break out the manual and study up on how to do this.
     
    Last edited: Aug 17, 2019
  9. Evertking

    Evertking How do I turn this thing on? Supporting Member

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    Could you explain a little more about how you place the tape? The side of a building??
    Thanks for the tip, when I grasp what your talking about I'm going to calibrate.
     
  10. smoke665

    smoke665 TPF Supporters Supporting Member

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    @Evertking there are numerous free downloads of focus charts you can make your own, here's one. FREE Lens Calibration Chart - Piston Photography I suspect Derrel's method works similar to the ruler on the right in the download. He's establishing a center mark on his tape and then shooting at an angle.

    I use a wide aperture to limit my DOF and use the view finder to auto focus on the cross mark at the center of the ruler, then take a photo. This is the center focus point. If focusing is accurate, the center point on the calibration ruler should be the sharpest point on the image and get blurrier as you move away from the center point. If any number above the 0 is clearer, then your lens is doing something called back focus. Otherwise, if any number below the 0 is clearer, it’s front focus.
     
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  11. Designer

    Designer Been spending a lot of time on here!

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    I think you should at least test all of your lenses and your camera's auto focusing ability. If you find some combinations don't work well, don't use those.

    It wouldn't hurt to fine-tune the focus of each AF lens you have, and if you find one will not meet your expectations, then trade it off for something better.

    Yes, it could be your lens, your camera, or yourself, but do find out where the weak parts are so you can adjust.

    BTW: are you hand-holding portraits? I think you should use a tripod.
     
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  12. Derrel

    Derrel Mr. Rain Cloud

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    Smoke nailed my method! I put. "0" on the tape and create a roughly 72"
    "Ruler" and shoot from 10 feet.I have 1-inch marks behind and in front of the "0"Distance. Tape to building
    Or fence.
     

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