I have a 50D and am interested in doing a microfocus adjustment on it, to ensure that it is working perfectly with my 400mm lens.
When I have read about doing this, it seems that every method involves setting the body and lens up and attempting to focus on some actual, physical, tangible object - then take images at several different settings, download, and visually examine the images. Or, to use Live View and actually look at the images and try to visually determine which is in sharpest focus. I am not sure I trust my eyeballs so much.
So, I am wondering if there is some way to do a microfocus adjustment in which I do not have to make a judgement call about what looks sharpest to me. Is there some way the camera can just confirm sharpest focus? Or some computer program that can just "look" at images, and determine the sharpest one?
My concern is that I may end up with a bunch of very sharp images, but that one of the settings will result in images that are a tiny bit sharper than the others - and that I will simply not be able to "see" the difference without equipment that is much more sophisticated than my eyeballs. Plus, I simply do not like having to make discretionary decisions, because there remains a chance that I may make the wrong one.
I trust technology a lot. I do not trust my eyeballs and my brain to work together well enough to make the best decision. Any advice or experience would be appreciated.