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  1. #21
    Super Duper Member
    kevy73's Avatar

    Re: Simple auto-focus calibration for DSLRs with adjustable settings.

    That sounds pretty cool and feasible.

    Will have to give it a try! I know my 85mm f1.4 is out by +11... will see if I get close to this when I do it this way.



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    Webpage: Kevin McGinn - Click Me! | Facebook - Like Me! | Youtube - Watch Me!

    Cameras Lens - Zooms Lens - Primes / Macro Lighting
    2 x D4 14-24 mm f2.8G ED 35 mm f1.4G 3 x SB900
    1 x D7000 24-70 mm f2.8G ED 50 mm f1.4G 3 x Westcott Ice Lights
    1 x D300 70-200 mm f2.8G ED 85 mm f1.4G
    1 x D5100 200 mm f2.0G ED VRII
    Sigma 150 f2.8 EX DG



  2. #22
    Senior Member
    J-see's Avatar

    Re: Simple auto-focus calibration for DSLRs with adjustable settings.

    I retuned my 300mm today after I noticed she was getting a bit soft at times. I had to dial her back by 2. I don't know if weather or "wear" is a factor.

  3. #23
    Senior Member

    Re: Simple auto-focus calibration for DSLRs with adjustable settings.

    Just finished going through the process. Set my 18-105 at -7 and my 70-300 at -5. I will admit I didn't keep changing the distance from the target for differing focal lengths through a lens; only so much space in my house. I did run more than one test at different focal lengths; occasionally getting some strange ranges (even with setting back button focus) and eliminating those trials.
    I like this system much better than using some type of angled target. I always struggled with that system; getting the targets aligned properly, being careful not to move the camera/tripod when removing/replacing the card, and especially when trying to judge the actual focus point on my computer screen. I just wasn't getting consistent results.
    D7000
    Nikkor AF-S DX 18-105mm F3.5-5.6G ED VR
    Tamron SP 24-70 F2.8 Di VC USD
    Tamron SP 70-300mm F4-5.6 Di VC USD

  4. #24
    Senior Member

    Re: Simple auto-focus calibration for DSLRs with adjustable settings.

    In the D7100 manual under the micro focus adjustment it states that adjustments made might affect the camera/lens accurately focusing at infinity, why is this as most of the things i shoot are near to or at infinity.

    P.

  5. #25
    Banned

    Re: Simple auto-focus calibration for DSLRs with adjustable settings.

    I think they ar just saying that the exact fine focus tune varies with the zooms focal length and if you get it spot on at the wide end it might be out at the tele end. This is why most peope set it at the longest focal length.
    This has never been a problem for me but if you get it out by a large amount it can affect the ability of the lens to focus in low light

  6. #26
    Senior Member
    canuck257's Avatar

    Re: Simple auto-focus calibration for DSLRs with adjustable settings.

    I had a few spare hours this morning so I thought I would put my lenses through the "Dot Focus" procedure. Because of limited space I did all of them at the same distance from the target. 18-55mm, 18-140mm 50mm f1.8, 70-300mm, Tamzooka. It's interesting that a couple of them had a range that was all on the plus side of zero. The focus ranges varied in length from 11 to 25 units.

    There are a couple of things that I am not sure of though. When the adjusted value is saved, what is entered into the "default" setting? Am I correct in assuming that A/F Fine Tune has to be switched on for these saved values to be applied by the camera otherwise it defaults to zero?
    Nikon D500 gripped
    Nikon D810 gripped
    AF-S VR Nikkor 16-35mm f4G-ED
    AF-S VR Nikkor 200-500mm f/5.6 E-ED
    AF-S VR Nikkor 24-85mm f/3.5-4.5G ED
    AF Nikkor 80-200mm f/2.8 D-ED
    Nikkor TC-1.4 III
    Kenko N-AF 1.4x Teleplus Pro 300
    Sigma EX 10-20mm f3.5 DC HSM

    Ivan










  7. #27
    Senior Member

    Re: Simple auto-focus calibration for DSLRs with adjustable settings.

    I was playing with this last night, using this method (which someone linked to, but I can't find the post). YIKES. Minus 20 and it's still not quite right, with two lenses. The difference between live view and the viewfinder focus was apparent even before I started zooming in. I always thought the "noise" I was seeing close up was from pixel peeping or the anti-alias filter, but that all went away with the live view focus.

    I'm going to try it again with better lighting. If I send my D7000 in for repair, I want to be certain it actually needs to be repaired.

    What got me wondering was that my Tokina 11-16 lens often seems to struggle with focus at anything other than 11mm. I took some pictures of a DC-3 at the Henry Ford Museum with it, and the 11mm picture looks reasonably crisp and clear, but the ones where I zoomed in a bit were badly focused, and I had to delete them. Of course, it's possible the Tokina has some issues of its own, too.

  8. #28
    Banned

    Re: Simple auto-focus calibration for DSLRs with adjustable settings.

    I never found the live view and dot method very accurate ..just try the ruler on the floor and use flash ..saves messing with a tripod ..do it at the longest focal length only. Another member was complaining about bad focus until he realized he was using jpeg and had not set the sharpness to +9 ( does not affect raw)
    Single centre AF-S focus when testing.

  9. #29
    Senior Member

    Re: Simple auto-focus calibration for DSLRs with adjustable settings.

    Quote Originally Posted by Love Nikon View Post
    I never found the live view and dot method very accurate ..just try the ruler on the floor and use flash ..saves messing with a tripod ..do it at the longest focal length only. Another member was complaining about bad focus until he realized he was using jpeg and had not set the sharpness to +9 ( does not affect raw)
    Single centre AF-S focus when testing.
    If that post was aimed at me, I was definitely using RAW, AF-S, single spot focusing. I also set the camera to self timer mode so that my hand wouldn't move the camera by accident.

    The tripod is nice because it's not moving around. I know that's not a critical element, but it does help reduce variables - picture A and picture B should be identical, but they aren't, so you know why.

  10. #30
    Banned

    Re: Simple auto-focus calibration for DSLRs with adjustable settings.

    You do it your way and I will do it my way ...good luck





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