Hi there,

I am an old school photographer and I have to say I was shocked to find the Nikon 70-200mm f/2.8 Lens for my Nikon 850 was not autofocusing correctly leaving my images blurry. I was about to lose faith when I learned that lens often times need to be calibrated to the camera. 

So, if you are finding that you have soft, blurry or out of focus images give the following links a read: (copy and paste into your browser)

https://www.blog.jimdoty.com/?p=21753

https://petapixel.com/2018/09/27/why-and-how-to-calibrate-your-lenses-for-razor-sharp-photos/

This tool helps figure out the distance for your lens/camera set up:

http://www.whibalhost.com/lensalign/ldt/index.html

This is the calibration tool I use. I always purchase at B&H Photo in New York - here is a link:

https://www.bhphotovideo.com/c/product/736849-REG/Datacolor_DC_SLC100_SpyderLensCal_Autofocus_Calibration_Aid.html