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Dot-Tune: Autofocus Fine Tuning in under 5 minutes
  
 
Joshua J. Ahern
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p.26 #1 · p.26 #1 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes


ok I will send an image 100% crop with exif in a moment.




Aug 20, 2014 at 08:02 PM
Joshua J. Ahern
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p.26 #2 · p.26 #2 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes


here's one image





Aug 20, 2014 at 08:13 PM
Imagemaster
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p.26 #3 · p.26 #3 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes


Send to Canon.


Aug 20, 2014 at 09:29 PM
moosehead222
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p.26 #4 · p.26 #4 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes


snapsy wrote:
It's free, it's fast, and it's much more accurate than any other method I've seen so far. What makes it faster and more accurate is that it doesn't rely on actual phase-detect focusing to derive the AF tune value. Because PDAF has shot-to-shot variability, all existing AF tune techniques require multiple images taken at each tune value to eliminate that variability from the equation. And it's the need for multiple shots that make those techniques more prone to AF tune measurement error. The concept is based on a recent discovery about the true nature of AF tuning - you can
...Show more

Thanks Snapsy!!



Aug 25, 2014 at 02:51 AM
kabraxcis
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p.26 #5 · p.26 #5 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes


tagged


Sep 10, 2014 at 09:07 PM
kabraxcis
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p.26 #6 · p.26 #6 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes


My 400/5.6 on the 7d is giving me -20 and +20 confirmation, I can't think of a workaround for this since it means the range is 40++, but I am doing this at a shorter distance than the recommended 10m (20m) distance, is this why?


Sep 13, 2014 at 01:27 PM
riokid
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p.26 #7 · p.26 #7 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes


Thanks Snapsy


Sep 13, 2014 at 02:14 PM
Joshua J. Ahern
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p.26 #8 · p.26 #8 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes


I sent it to Canon; nothing changed
same results when I use the 300mm + 1.4 II coverter



Sep 13, 2014 at 03:07 PM
RobertLynn
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p.26 #9 · p.26 #9 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes


The little triangles underneath the focus confirmation circle on the Canon cameras, wth do they mean? I referenced the manual and they are just called "AF Status Indicator."

When I do a dot tune, do I need to worry about them, or only the dot?

Thanks.



Sep 14, 2014 at 09:58 PM
Joshua J. Ahern
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p.26 #10 · p.26 #10 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes


So here's my results after a dot-tune with a 1DX + 300mm f2.8 + 1.4 v2 converter
Dot_tune Midpoint is +15
AF adjustments set to +15 on my 1DX

photo 01; text; horrible...it was even worse before the adjustment
photo 02; image of bird; kinda of blurry but not as much as before the adjustment

photos 03 and 04;
photo 03 is before the adjustment
photo 04 is after the adjustment
the blue color on the numbers seems to have been washed away

I shoot that paltes cause its something similar to numbers on soccer white jerseys;
there was kind of washed away colors or blurry image on jerseys...

photo 05; blurry again but not as much as before the adjustment
the blue color on the numbers is the "good color"
but this one was shoot while the registration plate was in the shade


tell me what you think...































Sep 19, 2014 at 08:05 PM
 

Search in Used Dept. 



Joshua J. Ahern
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p.26 #11 · p.26 #11 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes


here's another image I took with another 1DX
with the same 300mm + 1.4 v II converter

extremely sharp


The new 1DX is still on warranty.
Do you think a can ask Canon for a replacement,
since I can't get good results with this combo?









Sep 19, 2014 at 08:33 PM
ahender
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p.26 #12 · p.26 #12 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes


Have you tried taking images from say 0 through +10 (or -10) and just looking at the results and comparing those to a manually focused image in live view?

I first started with the Dot Tune method. Then I downloaded snapsy's new chart and just took individual images within a given adjustment range of 0 through +7.

I went from +4 to +3 with my 7D and 70-200 f2.8 II +1.4 TC.

A minor change but I can see that the results are better.

Not discounting the Dot Tune method. Really like the new chart.

After I made my adjustment, I then took sample images from all focal ranges and distances and was happy with those also.


Joshua J. Ahern wrote:
So here's my results after a dot-tune with a 1DX + 300mm f2.8 + 1.4 v2 converter
Dot_tune Midpoint is +15
AF adjustments set to +15 on my 1DX

photo 01; text; horrible...it was even worse before the adjustment
photo 02; image of bird; kinda of blurry but not as much as before the adjustment

photos 03 and 04;
photo 03 is before the adjustment
photo 04 is after the adjustment
the blue color on the numbers seems to have been washed away

I shoot that paltes cause its something similar to numbers on soccer white jerseys;
there was kind of washed away colors or blurry
...Show more




Sep 19, 2014 at 09:03 PM
Joshua J. Ahern
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p.26 #13 · p.26 #13 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes


ahender

yes I tried all the negatives values; no confirmation dot in this area.

Maybe I made a mistake; I reviewed the exif of my photos (those I inclosed here), and they were set to AI servo AF
I remember switching it to One Shot before starting the dot-tune. weird..

Coulld it be the problem? that the AI servo AF was on?



Sep 19, 2014 at 09:20 PM
ahender
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p.26 #14 · p.26 #14 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes


Joshua J. Ahern wrote:
ahender

yes I tried all the negatives values; no confirmation dot in this area.

Maybe I made a mistake; I reviewed the exif of my photos (those I inclosed here), and they were set to AI servo AF
I remember switching it to One Shot before starting the dot-tune. weird..

Coulld it be the problem? that the AI servo AF was on?


Use one shot, single focus point, tripod, shutter release cable or timer. 50 times focal range. That should be 68 feet for 300+1.4 TC.

I just mounted snapsy's "new" chart on a clip board and found something to hang it from, then taped it to keep it from moving.

After each adjustment and shutter release, make a new adjustment, de-focus the image, then retake the image.

I would look at each image by zooming in to see where the quality started degrading or getting better.

Leave the setup as is, take the memory card inside and look at 100% in Photoshop or similar program.

I did this twice to see if the results were repeatable.

Just select the value you think is the sharpest.

If nothing is close to what you get from manually focusing, then you probably need to send the camera and lens in to have them calibrated.




Sep 19, 2014 at 09:39 PM
Joshua J. Ahern
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p.26 #15 · p.26 #15 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes


I had another 1DX last year.
The combo 1DX + 300mm 2.8 and 1.4 vII converter was perfect!!!
The images were very sharp.
I didn't have to make any AF adjustment.

Now I have a new 1DX. Seems that the combo doesn't work as good as the last one.

You think Canon CPS can fix that?



Sep 19, 2014 at 09:48 PM
ahender
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p.26 #16 · p.26 #16 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes


Joshua J. Ahern wrote:
I had another 1DX last year.
The combo 1DX + 300mm 2.8 and 1.4 vII converter was perfect!!!
The images were very sharp.
I didn't have to make any AF adjustment.

Now I have a new 1DX. Seems that the combo doesn't work as good as the last one.

You think Canon CPS can fix that?


If you are not happy and micro adjustment does not fix the problem, then send it in. Is the lens combination new also?



Sep 19, 2014 at 10:00 PM
Joshua J. Ahern
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p.26 #17 · p.26 #17 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes





If you are not happy and micro adjustment does not fix the problem, then send it in. Is the lens combination new also?


No, I used this combination before, 300mm f2.8 +1.4 vII converter but with another 1DX.

As I said previoulsy, the combinaison of my ex-1DX + 300mm f2.8 +1.4 vII was working perfectly.
I didn't have to make an AF adjusment.

Now I have a new 1DX since few months, and the results of the combinaison is awfull, as you can see with the images I posted earlier.

So I can ask Canon to fix the problem? or even change the 1DX?

thanks



Sep 20, 2014 at 02:05 AM
Methodical
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p.26 #18 · p.26 #18 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes


How's this for long lenses (300-800)?


Oct 28, 2014 at 06:08 PM
schlotz
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p.26 #19 · p.26 #19 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes


It works! Remember recommended distance to target is 50x the lens mm.


Oct 28, 2014 at 09:22 PM
dkperez
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p.26 #20 · p.26 #20 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes


Just found this discussion because I shot some images with my D810 using the Nikon 500/f4 with a 1.4X and they aren't as sharp as I'd like. Since I was photographing water birds I can see that the water in FRONT of the subject is very sharp and by the time it gets to the bird it wasn't quite sharp... I don't see this on my D300, but the 810 is absolutely brutal for sharpness... I was going to put a very small piece of an image in, but it appears that I can't.

SO, I printed a chart, figured out I need about 115 feet for the 500 with a 1.4, got myself all excited, and went outside with a long tape measure to set up and give it a try.................. AND IT'S RAINING!!!!!!!!

I'll give it a try tomorrow...



Oct 28, 2014 at 09:35 PM
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