I know that sometimes a lens/body combo needs to be micro-adjusted to attain ideal focusing behavior, and that this is usually because of sample variation, but which parts of the lens and/or body are actually the primary causes of front/back focus?


1 Answer 1


It can be any number of different things. It all comes down to the tolerences that consumer cameras are built to.

Typical suspects would include:

  • Lens Element locations
  • Flange-to-film distance
  • Sensor location
  • Focus sensor

It is all about the location of the focal plane as outlined here: What is back-focusing?


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.