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.
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
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
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.
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.
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.
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.
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.
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...)
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.
?