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Set the AF microadjustment in the camera settings to back focus all the time. Experiment until it’s pretty accurate
PhilDAS-
Been reading about that. I don't think it's an option on a 450d?
This guy offers a bit of insight https://www.dpreview.com/forums/post/31460122 I don't think it's worth sending this camera off to be serviced, right? It's 10 years old...
frankenbike
Example: I set the AF to the central point so that it would focus at the cassette. Red "I'm in focus now" dot appears. As you can see it's come up about half-way along the chain instead. In fact I think in general it tends to focus too close.