I have recently got me a used 10D, in great condition.
Except, its focus is always slightly off, even with old manual focus lenses:
- with AF lenses, the camera will focus normally, I get the confirmation bleep, and fire. When zooming in I see that the actual sharp area is just a little before the intended sharp area.
- even more worryingly as a manual focus fan, when I focus by turning the MF wheel of an old Legacy lens until I see a razorsharp image in my viewfinder (I've done this a million times before with other DSLR's) and fire, the image when zoomed in is also slightly soft, when looking at objects a little nearer to the camera, they are sharp.
I've tested the above nth times, with different lenses. The sharp image I see in my viewfinder is not the same when I zoom in on the finished photo. When I intentionally misfocus a little bit, to something a little farther away, then the main subject, which looked slightly out of focus in my viewfinder, will be sharp in the finished picture.
Is this what is known as a front-focus (or back-focus) problem? Or is it something else? It's not a diopic corrector issue.
No, focus slighty in front if the back part is more in focus or in back if the front of the subect area needed is more in focus or send in for calibration...
i had to change the shims in my 10D to get it to focus correctly with MF, shims can be purchased from canon parts... very cheap. AF is more difficult... the 10D was always known to be a little sloppy in focus... I just stopped down 1-stop if I was worried and mine was good enough.
