Major frustration in D800 AF Tuning even with DotTune Method

Started Jan 24, 2014 | Discussions thread
OP ZionImage Regular Member • Posts: 330
Re: Major frustration in D800 AF Tuning even with DotTune Method

Truman Prevatt wrote:

ZionImage wrote:

I'm trying to AF Fine Tune my D800 with various Nikon lens using DotTune method developed by Horshackdescribed in his youtube video DotTune: Autofocus fine tuning in under 5 minutes http://youtu.be/7zE50jCUPhM

What you will find is there is a board range where the "dot is still on." Which sitting is right. Then if you are using a zoom you change the focal length and things will change. The you change the distance and things will change.

That is physics. The goal should not be to fine AF offsets for lenses but to take photographs.

First thing is to forget all this forces target nonsense - it would be great if the only thing you took pictures of was focus targets. Go out and find a target - one you would normally take a picture of. Make sure it has a lot of detail. Set up a tripod at a nominal distance you will most often use with a lens. Forget the rules. Do the live view focus and take a shot. Better yet manual focus on live view and take an image. Then if you have some idea of what the fine tune should be and start there. Take images at settings +/- 8 on either side. If you have no idea take raw images at -20 to +20. Down load the images into you raw converter and covert them with no sharping.

Find when are the sharpest. That is you fine tuning.

Paper targets and rulers are wonderful if all you ever plan to photograph is paper targets and rulers.

Truman
www.pbase.com/tprevatt

Truman,

I totally appreciate your perspective.  In fact, I agreed with you that I shouldn't have to care about this AF Fine Tuning, Monitor Calibration, Color profile all these stuff.  Back 15-20 years ago, when I was shooting with my D4S, I didn't have to do any of these and still get great sharp images.  Unfortunately time changed with digital camera that comes with lot of goods but also these stuff that took me away my time from taking photos.

When I first my D800 over a year ago, I didn't care about test the AF system and fine tune my camera.  I did a job with a good customer who is very influential in the community.  Some of the most important images were out of focus.  He was so upset that I lost his business and all the referral I could have from him.  I did some test and found that the focusing system has some issues and ended up sending it back to Nikon to repair.

Over the last year, I tried different AF tuning method and it has been frustration.  Out of focus images keep popping up and forced me to now only use 2 lens out of 8 I have.  I have a couple shots coming up that I really would like to use my 135/f2 and 80-200/f2.8.  Well, that forced me to do these fine tuning again.

Unfortunately, I mostly shoot people and kids.  I don't have the luxury to do what you suggested in a control environment to do the adjustment.  I'm starting to think that may be the only way out is to shed some money to buy Focal Pro as Godspeak suggested.

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