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Auto Focus Fine Tune


South Lake Tahoe, US
214 posts

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TakeTwo Silver Member Nikonian since 26th Jul 2009
Wed 24-Aug-11 02:51 AM

My question is, What is the right way to set up a given lens using the auto focus fine tune feature for.

I'm wanting to use this feature for prime lens only. Yesterday I set aside an hour to fine tune in my 500mm f4 lens and below is the steps I used.

Rigid studio tripod. Test chart at 18 feet. lens parallel to the chart. I manually focused the lens on the chart and took a shot of the chart at each f stop to find my lens sweet spot (F8) for sharpness.

So I set the lens to f8 and began to use the auto focus feature. I started ad +20 and took a picture at +20 +15 +10 +5 0 -5 -1- -15 and -20. Pulled the card and looked on my pc and did not see any change in focus. All were tack sharp. So my question is help please.

How am I suppose to find out if the lens is in tune with my d7k if I don't know what I"m doing.

Do I use auto focus each and every time for every shot I take with the different values of the auto tune? In other words do I pull the camera out of focus for each shot and let the auto focus do its thing?

I'm a bit confused.
I tried 4 prime lens and came up with the same results on all of them.

I remember reading that some people use the auto tune to have more front focus, and some for more rear focus.

I"ll ask the experts before I continue on my blind path.

I think I really just want to find a nice balance with my lens. 1/3rd front focus and 2/3Rd's back focus. Thanks, Don

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