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Dot-Tune: Autofocus Fine Tuning in under 5 minutes

ryn996
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p.21 #1 · p.21 #1 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes

snapsy wrote:
When tuning a zoom on a 5D3/1DX/6D you have to use *only* the extreme ends of the zoom (24 and 105 in your case), otherwise the camera will interpolate the effective tune value for the in-between focal length based on both the wide+tele tune values, which will yield unpredictable results. This applies to any tuning method (not just DotTune).
Thanks! I'll redo it for 24mm.

Dec 09, 2013 at 02:08 PM

snapsy
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p.21 #2 · p.21 #2 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes

FYI, Canon has patented several automated AFMA techniques, one of which is similar to the Magic Lantern implementation of DotTune but Canon's implementation also automates the CDAF portion of the procedure. Hopefully these are coming to a Canon camera soon

Canon Rumors Article
Patent PDF (English)

Jan 14, 2014 at 12:52 AM

Herb
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p.21 #3 · p.21 #3 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes

ryn996 wrote:
I did it for my 24-105 on my 5D3. I got an average of -1 for the wide end (I choose 35mm) and the same for 105mm. I guess that is a good thing

?
my 24-105 was +4 for T, +2 for W

Feb 10, 2014 at 08:12 PM

hillwalker
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p.21 #4 · p.21 #4 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes

Great thread. This really helped me out. Thank you!

Feb 12, 2014 at 12:14 AM

snapsy
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p.21 #5 · p.21 #5 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes

FYI: After considerable testing I've created new AF target based on a cross-hatch of variable width lines. This new target produces much consistent results compared to the focus chart I used in the video. You can download the new target here.

Feb 15, 2014 at 09:35 PM

jcolwell
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p.21 #6 · p.21 #6 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes

Thanks Adam.

It makes me dizzy to look at on a big screen, but it looks very clean.

Feb 15, 2014 at 09:44 PM

sritri
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p.21 #7 · p.21 #7 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes

Thanks .

Feb 16, 2014 at 01:23 AM

Fred Miranda
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p.21 #8 · p.21 #8 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes

Updated first post with new download link for Bob Atkin's focus chart used in the video.
Best,
Fred

Feb 16, 2014 at 02:30 PM

Sjjindra
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p.21 #9 · p.21 #9 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes

Snapsy (Adam)

I have noticed this thread going for quite a while, but didn't read enough to catch on to the Dot-Tune technique. Yesterday, after seeing a reference to it in another thread, I finally read through the instructions, had a photo of your cross hatched target printed, and MA'd about 20 lenses to my 5DIII in about 2 hours.

What an easy to use system that make sense.

Thanks for developing and sharing it.

Steve

Mar 02, 2014 at 09:48 PM

skasol
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p.21 #10 · p.21 #10 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes

I am going to give this a try before buying the Reikan Focal software. thank you using it on a 5DIII and 1DX

Mar 03, 2014 at 11:17 AM

skasol
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p.21 #11 · p.21 #11 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes

just used the system, it looks pretty decent to follow, I only done primes so I guess I will need to figure out how to do the zooms I am assuming I would be checking values on both ends of the lens. it seems pretty straight forward.
I will see how it translates to results. I even calibrated my sigma 35 1.4 I have the usb with this seemed to be easier to do. thank you for the method, my 50 1.2 was way off.

Mar 03, 2014 at 12:37 PM

bushwacker
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p.21 #12 · p.21 #12 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes

Herb wrote:
my 24-105 was +4 for T, +2 for W

Okay so for your 24-105 lens right....

@ T = +4
@ W = +2

So which value I am going to follow now? I meant which value am I going to enter?

Mar 03, 2014 at 09:28 PM

dgdg
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p.21 #13 · p.21 #13 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes

bushwacker wrote:
Okay so for your 24-105 lens right....

@ T = +4
@ W = +2

So which value I am going to follow now? I meant which value am I going to enter?

I cannot imagine these two mfa's are really that different, especially for that lens wide open. If you picked 2,3,or 4, your images should be fine.

Mar 03, 2014 at 09:47 PM

Focus Locus
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p.21 #14 · p.21 #14 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes

Many thanks to snapsy and Fred Miranda for keeping this thread alive and updated.

Mar 03, 2014 at 11:10 PM

skasol
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p.21 #15 · p.21 #15 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes

Many thanks. Specially the updated chart and easy to follow instructions. Thank u.

Mar 03, 2014 at 11:23 PM

bushwacker
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p.21 #16 · p.21 #16 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes

dgdg wrote:
I cannot imagine these two mfa's are really that different, especially for that lens wide open. If you picked 2,3,or 4, your images should be fine.

Dude... I have a 5d2 there's only one entry. I don't have T and W options.

Mar 03, 2014 at 11:45 PM

snapsy
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p.21 #17 · p.21 #17 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes

bushwacker wrote:
Dude... I have a 5d2 there's only one entry. I don't have T and W options.

Since your range between T and W is so tight you should get great results using the average of the two (+3 in your case).

Thanks everyone for the thank yous

Mar 03, 2014 at 11:48 PM

dgdg
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p.21 #18 · p.21 #18 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes

bushwacker wrote:
Dude... I have a 5d2 there's only one entry. I don't have T and W options.

Right, pick 2,3, or 4 and it will be fine. As noted above, you could aim for the middle at 3. These mfa differences for an 24-105mm f/4 lens are likely to be imperceptible.

Mar 04, 2014 at 08:47 AM

Jocce81
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p.21 #19 · p.21 #19 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes

This method seems to be a good thing for me to try!

I've tried to read through the entire thread, but there is a LOT to read through...

Just three quick questions:

1. How do I Establish critical focus in Live View? Using Live-View af? Or by manually adjusting the focus (and by so it is my eyes that have to make the decision?)

2. Will a Halogen-Spotlight right on the target do, or do i need daylight?
2a. Will the printed target printed on a Office Laserprinter (Xerox 7120) be enough quality?)

3. Can I make the screen be on at all times, even when pressing for AF-Confirmation? (So I don't need to hop in to the menu every time...)

Thanks !

/Jocce

Mar 05, 2014 at 04:51 AM

schlotz
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p.21 #20 · p.21 #20 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes

Welcome to FM Jocce.

1. Yes the final adjustment will be manual using your eye to get the target as sharp as possible in Live view mode.
2. While you can do either I would suggest to use the light that you mostly shoot in. Studio or outdoor? Very important to have sufficient amount of light. Printed target using fine setting should be sufficient quality.
3. Not certain what camera you are using. I'm in the Canon camp and no, there is a bit of button pushing for each iteration. I did set AFMA as a selection in my top menu to help. It's not too difficult to quickly change the AFMA amount and test for AF.

Regards,
Matt

Mar 05, 2014 at 07:51 AM

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