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| p.17 #17 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes |
Any word on the Magc Lntrn implementation of automated method for 6D? Looked at the ML site but not sure what I'm seeing there...
I'm using it right now on my 6D. It's great! However, I found one bug. If you don't register the lens manually first, the ML software won't notice this and it will think it's changing the MFA setting but it's failing to do so. Therefore, it will get a focus confirmation at every value it tests and it will just set the final AFMA to zero. To register the lens manually just go to the custom function and press the Q button to register it. (The screen will say "[Q] Register.") This opens the MFA setting screen and you just hit Set to back out. You don't need to actually change anything. You will know it worked if the previous screen now says "[Q] Change".
I didn't read the instructions on the ML web site, so maybe they mention this. Here are some quick instructions if the ones there aren't clear. I'm assuming you already know how far away your focus target should be, etc.
1. Make sure your lens is registered as per the above paragraph.
2. Setup your camera pointing at a focus target.
3. Make sure your center AF point is pointed directly at your focus target, and you only have the center point selected for AF.
4. Achieve critical focus in Live View focusing. I just put the lens in AF mode and use Live View's contrast detect mode to achieve focus. It's never let me down.
5. Put the lens in MF mode. (If you forget, Magic Lantern will abort the procedure when you start it.)
6. Enter the ML menu and highlight the Dot Tune menu option and press Set.
7. Scroll to the bottom option and choose whether you are setting the wide end of a zoom or the tele end of a zoom. The wide option is also the option for primes. You can also choose "All lenses", but who would do that?
8. Scroll to the top option to search the default -20/+20 range and press Set.
9. Wait and watch the screen. The software will open the standard Info screen you will see text appear explaining that you should already have achieved focus on your own, and to keep the camera still (obviously.) Then it scrolls through the MFA settings and starts plotting a graph on the top of the screen showing when it did and didn't achieve focus confirmation. It checks the whole range 4 times and then picks the center of the range where it achieved the best confirmations, and sets this value for you automatically.
10. If using the default -20/+20 range caused it to achieve solid focus confirmation at either of the two extremes (-20 or +20) then you should try again with the -40/+40 range. (Yes, it appears the software can set values higher or lower than the camera natively can.) The reason you want to broaden the range is in case it would have also found confirmation at -21, -25, or even lower. (Or past +20 on the positive side.) The technique will be unable to find the true middle unless you find both ends of where it stops achieving focus confirmation. For example, my 85mm f/1.8 needed a setting of +20. During testing, confirmation was still achieved all the way up at +32. This is an example of where the traditional Dot Tune technique would have failed since you can't natively set the value higher than +20. But Magic Lantern can go up to -100/+100! If you or ML select a value greater than or less than the default -20/+20 range then the Custom Function menu will display 0, but the MF setting will display the actual value.
Here's a photo of it in action: