![]() ![]() Don't print it too large for the distance you are shooting as you won't be able to see the focus differences. Print the chart at an appropriate size and hang vertically in a well-lit location. Hit "original size" link to lower left then right click "save as"Ģ Use a well–lit location. Use this chart for quantifiable focus adjustment evaluation. This flat out works for even the most difficult to tune lenses such as Nikon's DC lenses (I just wrote this off the top of my head so there are a few typos in there I'm sure). Don't shoot a very short distance unless that is your intended final shooting distance.įor formal adjustment of the AF tune, here is how I do it. Picking a distance similar to what you will be shooting most often is best if possible. Keep in mind the tune is accurate for the distance to that piece of debris and may be different close in or far away. Then I can adjust the fine tune a few times and again zoom in on the LCD to see where the sharpest grass is and have it pretty close to being right on (note that this is basically a variation of the "angled ruler" tune technique). ![]() Zooming in on the LCD will often show that the grass is perfectly sharp right at the target, before the target, or after the target. For example if a buddy hands me a lens I've never used before I can do a very quick and dirty AF tune in about 2 minutes simply by shooting the lens wide open down at an angle to a small target (such as a leaf or piece of debris) in a patch of grass in front of me. In practice, many experienced photographers can do an informal fine tune in the field. : ) There are many methods out there for AF tuning and whatever works well for an individual is the best. I know the question "What is the best way to fine tune" is coming in this thread. Then if you want to transfer that to the lens via the dock just use 1 nikon Af tune adjusment unit = 2 Sigma Af tune adjustment units (don't forget to set the camera's af tune back to zero if you fine tune the lens via the dock). You can use the in-camera AF-fine tuning if you want to quickly see if there is a noticeable difference in sharpness at very long range. Also minimize atmospheric distortion by shooting very early in the morning and not over a bunch reflective surfaces, if possible. turn the lens's OS to off, and use mirror-up remote release/ or self timer of at least 20 seconds (to give the camera time to settle down after you press the shutter release). Make sure you have excellent stabilization (use tripod plus lens resting on a chair/sandbag or something if you have to). Also don't forget to set your lens to minimum focus in between every shot. ![]() The live view shots are what you are trying to duplicate/approach with the Af tune adjustments. Take some shots in live view and compare your viewfinder-focused shots to the live view shots. A license plate has big letters/numbers, medium sized state lettering, and tiny license tab lettering which really allows you to see any changes in sharpness. I shoot a well lit, very far away, car license plate as a target for infinity adjustment. Zooms obviously have more points to enter vs. Then detach the lens and hook it up to the dock and set the adjustment values on your computer all at once and you are done. 50' or whatever the point is for your lens), write it down, and so on until you get all four values. 15'), find the AF tune optimum value, write it down, then move to the next measure measurement point (f.e. If you want to do all 4 distances at once, just set up the target and measure to where to set up the camera (f.e. This post below was for one distance (infinity), repeat at any other distance you want to tune for. You'll have to try it to find out for your lens probably.ġ) re how to tune at infinity. So the 1 nikon unit to 2 sigma units may apply only to the 150-600S, I don't know. Also Bill slattery Jr.stated that the 1 nikon unit = 2 sigma units was different on one of his lenses. 1st post is a short description, 2nd is detailed method, 3rd is an example of results after using this method. Here are some relevant posts that may be helpful. It is fast and accurate if u are methodical in your method and pay attention to details such as good light, tripod, vertical target, focus on infinity between shots etc. I like the af tune procedure shown at “1)” in the text I pasted below. I guess what I’m getting at is u may be able to accomplish the improvement u are looking for for free (but takes time though). Have any of you tried this service? Did you get results that you are happy with?ĭo they do anything different than you can do at home with the dock? I'm considering paying Sigma's $100 fee to get my 24-105mm calibrated in their shop to my D750. ![]()
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