DotTune: Video Tutorial for AF tuning without photographs

Started Feb 18, 2013 | Discussions
Horshack
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DotTune: Video Tutorial for AF tuning without photographs
Feb 18, 2013

I've just posted a video tutorial of the DotTune AF fine tuning method. Here's the link:

DotTune Video Tutorial (YouTube) 

And here is a link to the original DotTune thread.

Note: link to video updated by moderator per the O/P's request

Stevequad
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Re: DotTune: Video Tutorial for AF tuning without photographs
In reply to Horshack, Feb 18, 2013

Very informative, thank you. Now I will go out and give it a try with a 800e and a few lenses.

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Robin Casady
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Re: DotTune: Video Tutorial for AF tuning without photographs
In reply to Horshack, Feb 18, 2013

Thanks Horshack.

How much does the range vary? Instead of moving increment by increment can you take a jump to speed up finding the other end of the range?

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michaeladawson
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Re: DotTune: Video Tutorial for AF tuning without photographs
In reply to Robin Casady, Feb 18, 2013

Robin Casady wrote:

Thanks Horshack.

How much does the range vary? Instead of moving increment by increment can you take a jump to speed up finding the other end of the range?

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Robin Casady
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"The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts."
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Certainly you can.  You're only interested in the endpoints.

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Mike Dawson

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macfred
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Re: DotTune: Video Tutorial for AF tuning without photographs
In reply to Horshack, Feb 18, 2013

Thank you--very helpful!

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WSSA #318

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Robin Casady
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Re: DotTune: Video Tutorial for AF tuning without photographs
In reply to michaeladawson, Feb 18, 2013

michaeladawson wrote:

Robin Casady wrote:

Thanks Horshack.

How much does the range vary? Instead of moving increment by increment can you take a jump to speed up finding the other end of the range?

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Robin Casady
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"The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts."
— Bertrand Russell

Certainly you can. You're only interested in the endpoints.

Knowing range variability would make it easier to guess at the jump amount.

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Daniel Clune
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Re: DotTune: Video Tutorial for AF tuning without photographs
In reply to Horshack, Feb 18, 2013

Very interesting. I will have to see how it compares to how I allready fined tuned my lenses. See if this way does a better job than the old fashioned way i did mine.

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OOPSOS
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Re: DotTune: Video Tutorial for AF tuning without photographs
In reply to Horshack, Feb 18, 2013

Thank you for posting

What focal length to use if lens is not prime?

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Robin Casady
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Re: DotTune: Video Tutorial for AF tuning without photographs
In reply to OOPSOS, Feb 19, 2013

OOPSOS wrote:

Thank you for posting

What focal length to use if lens is not prime?

Start with the middle of the zoom range. Check the extremes to see if they are different. If they are, you have to decide what is important to you. Do you want to stay with the middle, or do you want to pick a fl. that is most important to you.

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CRiddell
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Re: DotTune: Video Tutorial for AF tuning without photographs
In reply to Horshack, Feb 19, 2013

Really great post, thank you

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Shotcents
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Re: DotTune: Video Tutorial for AF tuning without photographs
In reply to Horshack, Feb 19, 2013

Horshack wrote:

I've just posted a video tutorial of the DotTune AF fine tuning method. Here's the link:

DotTune Video Tutorial (YouTube) 

And here is a link to the original DotTune thread.

Note: link to video updated by moderator per the O/P's request

I assume you've tried this and seen the results. How do think this compares to the methods most of us have been using?

Excellent work and looking forward to trying!

Robert

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Horshack
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Re: DotTune: Video Tutorial for AF tuning without photographs
In reply to Robin Casady, Feb 19, 2013

Robin Casady wrote:

Thanks Horshack.

How much does the range vary? Instead of moving increment by increment can you take a jump to speed up finding the other end of the range?

It depends on the lens. On my Sigma 35mm f/1.4 the range is very small, only 4 AF tune units. On my 50G f/1.4 it's 9 tune units. You can jump around at any increment you'd like when trying to locate the general are of the range.

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Raul
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Re: DotTune: Video Tutorial for AF tuning without photographs
In reply to Horshack, Feb 19, 2013

Thank you. Unfortunately, focus at infinity is affected as Nikon anticipated. Silly, faulty camera!

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mikemsphoto
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Re: DotTune: Video Tutorial for AF tuning without photographs
In reply to Horshack, Feb 19, 2013

Very nice job, thanks a lot for posting this. Elegantly simple.

(LensAlign is going to hate you.)

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Fastmikefree
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Re: DotTune: Video Tutorial for AF tuning without photographs
In reply to Horshack, Feb 19, 2013

Horshack

You are the Man! Simple and efficient! I am getting much more reliable and concistent results with your method compare to any other one and/or software that are available on the market.

Many thanks for sharing

Phil

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Daniel Lauring
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Re: DotTune: Video Tutorial for AF tuning without photographs
In reply to Horshack, Feb 19, 2013

Nice job, Horshack.  Your explanation is easy to follow.

People might want to choose the distance they most use the lens at, vs. the 40 times the focal length, if the tuning varies with distance.  Likewise for zoom lenses they might choose their most common zoom range vs. the midrange.  Or, they might choose the longest zoom focal length where the affect of miscalibration is the worst.

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fpessolano
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Re: DotTune: Video Tutorial for AF tuning without photographs
In reply to Horshack, Feb 19, 2013

Nice.

After a huge FoCal failure I am going to try this one

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fpessolano
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Question
In reply to Horshack, Feb 19, 2013

I tried and I got to a range of -14 and +20 ..... but since I reached +20, I actually cannot say what range I have. Or do I use +20?

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lock
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You have provided al the ingredients for an automated AF adjustment system.
In reply to Horshack, Feb 19, 2013

All the hardware is already inside the camera! They only need to provide a default test setup. Tell them to use all AF points and to add two extra extreme values for zooms. If you do that, than maybe if my future camera will be a Nikon again, I could enjoy this system.

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Robin Casady
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Re: DotTune: Video Tutorial for AF tuning without photographs
In reply to Horshack, Feb 19, 2013

Horshack wrote:

Robin Casady wrote:

Thanks Horshack.

How much does the range vary? Instead of moving increment by increment can you take a jump to speed up finding the other end of the range?

It depends on the lens. On my Sigma 35mm f/1.4 the range is very small, only 4 AF tune units. On my 50G f/1.4 it's 9 tune units. You can jump around at any increment you'd like when trying to locate the general are of the range.

Thanks. Just out of curiosity, any idea what characteristic of the lens determines the range?

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"The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts."
— Bertrand Russell

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