Lens Fine Tuning Question.

NikonShuterBug

New member
I submitted the thread, Fine Tuning Lenses???, and appreciate all of the replies, very helpful. I now have the info needed for each lens.
I have a question pertaining to my AF-S DX NIKKOR 18-140mm f/3.5-5.6G ED VR lens. While checking the lens at different focal points I have different issues. Can I make two adjustments on one lens? Listed are the result of my test.

@ 20mm, Back Focus 3.5 inches

@ 60mm, Tack Sharp

@ 130mm, Front Focus ¾ inch

Thank you.
 

Camera Fun

Senior Member
I took an average of my results and then tried to weight the final decision based on the focal length range I used the most for a given lens. Once you pick an adjustment, take some photos and evaluate the results to see if you need to modify the adjustment. I would also suggest trying the process again at some point in the future to see if your results are consistent. I ended up using the dot-tune method as any method using an angled target was always a challenge for me to get the alignment correct.
 

NikonShuterBug

New member
@ 20mm, Back Focus 3.5 inches


@ 60mm, Tack Sharp


@ 130mm, Front Focus ¾ inch


So if I choose to make the correction for say the 130mm, will this apply through out the whole adjustment range of the lens? In other words, will making the 130mm adjustment throw off the 60mm setting which is tack sharp?
 
@ 20mm, Back Focus 3.5 inches


@ 60mm, Tack Sharp


@ 130mm, Front Focus ¾ inch


So if I choose to make the correction for say the 130mm, will this apply through out the whole adjustment range of the lens? In other words, will making the 130mm adjustment throw off the 60mm setting which is tack sharp?

It will change it some but probably not as much as you think. The best thing you can do it is test it and see.

What method did you Usero fine tune that you would know the distance each zoom is off?
 

NikonShuterBug

New member
First, thank you for your reply. I used many methods. The one I prefer is to put a book at a 45deg angle, and set the aperture wide open at given distance per focal length. This made it very easy to identify an issue.

Also, I noticed when focusing in Live View, the back screen, the focus is much sharper than using the shutter focus button, or the back button focus control.
 
Top