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These cameras have microadjustment capability, just not in a user-accessible way. The exact method varies by model. Some have a software feature in an advanced (and secret) "debug" menu — the Pentax K10D, for example, had this. Others have physical adjustment screws or similar (like earlier Canon Rebel models). Or, repair centers may simply use shims. To ...


4

It appears your test chart and camera may not be properly aligned with each other. Until that is corrected your results will not be valid. If, as appears to be the case, the left side of the chart is farther from the camera than the right side, then it is possible that the portion of the chart displaying -10mm is the same distance from the camera as the ...


3

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?


3

See your camera manual for the situations when the AF-Assist illumination does not work. It does not work in Live View mode. It does not work unless you have the center focus point selected. Does not work if continuous focus is selected (so use AF-S). There is a menu A2 where it can simply be turned off. Also AF-Assist does not work in Manual focus mode, ...


2

Front or back focus issues can be the result of any of several issues. It's usually a combination of more than one of them since there's no such thing as a perfectly aligned lens, mounting flange, and focus system. The focus elements in the lens not moving exactly as the camera instructed is only one such cause. That particular issue most often results in ...


2

The camera body is only half the equation - the lens is the other half! The optical elements located in the lens must be properly aligned so that there is the correct distance between them and the sensor in the camera body. The only physical thing with the body that can require focus correction is a slightly different distance from the lens mounting flange ...


2

I'm lazy, so for me, "best" means easiest. YMMV. :) I use Magic Lantern, with the dot_tune.mo module to perform auto dot tune. Dot tune was developed by horshak on dpreview. You don't have to take any pictures with it, it's fast, free, and uses the data of when the AF confirmation dot lights or (or doesn't), with a lens set to critical focus manually, while ...


1

I wouldn't panic just yet. As noted in a comment to the other question, I don't think your results are quite final yet. Assuming there is an issue, there's one way: sent them together into Canon for service. They may do this for free (Pentax did with my K10D, before Pentax started including a micro-adjust feature on their cameras), but may charge some (I ...


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