DotTune: Video Tutorial for AF tuning without photographs

Started Feb 18, 2013 | Discussions thread
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Re: Read Me: Major discovery for reducing confirmed range
In reply to WIMorrison, Mar 17, 2013

WIMorrison wrote:


you post about leaving the AF enabled on the body and the lens confuses me and I wonder if I can ask a simple clarification point?

my view is that I leave AF enabled then when I press the button shouter or AF on) then the lens motor will activate moving the focus negating the objective of changing the focus using the micro-adjust to move the focus to the same place as the live view focus.

can you please explain what you are suggesting? I trmethods dot tune today on sigma 50-500mm at 500 with f6.3 today and got 4 different midpoints, -8, -2, 6, and 15. Clearly something is wrong as neither the camera or target moved during the tests. I tested at 15m which is the range that I will be using the lens at.

hopefully you will be able to help me

You must configure the camera for back-button focusing ("AF-ON only") so that a half-press of the shutter wont reacquire focus while you're DotTunning.

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