This question about Canon DSLR cameras and various lenses has five parameters. I don't have a specific lens in mind, I have not needed to calibrate any of my lenses in the past. This is just for my general knowledge...
1. If I have a third party lens (such as a Tamron or Tokina) that I use with my Canon DSLR cameras and it front or back focuses; can I use the Canon calibration to fix this?
2. If I use the same lens with more than one camera body, do I need to calibrate the lens for each body and will the setup remember which lens/body combination I am using?
3. Is lens calibration a one-time thing or do I need to check the lens regularly?
4. Will older lenses such as the EF 50mm f/1.8 Mk.1 or the EF 135mm f/2.8 SF calibrate if needed?
5. I understand the principle behind calibrating a prime lens but, is calibration of a zoom lens possible?