From Reikan:
Reikan has released a major update to its automated focus calibration and testing software FoCal for both Nikon and Canon cameras.
FoCal 2020 includes the unique ability for users to compare lens calibration and focus test results directly with results from other FoCal users around the world, helping to answer the age old question, "Is my camera/lens a good copy?".
New features in FoCal 2020 include "Calibration Check", a rapid test to quickly determine whether a particular camera/lens combination would benefit from lens calibration and "MultiTest". The MultiTest function is the most comprehensive way to test lens calibration available across the entire aperture range. Looking at all apertures means FoCal is able to calculate the ideal focus adjustment not just when the lens is 'wide open' but also what happens across the most commonly used apertures.
Get Reikan FoCal at B&H.