50D can not focus accurately at long distance

With fast the lenses in my collections, 35L, 50 1.4, 50 1.2 and 85 1.2 ii, my 50D has a hard time getting accurately focus, if I am 5 feet or longer from the subjects. If my subjects are closer than 5 feet it is spot on even at f1.2 or 1.4. However with my slower zoom, f2.8 or slower, it focuses perfectly most of the time regardless on the length between me at the subjects. Is there anyone out there with the same issue or does my 50D has some issues?

Your camera might need calibration or have a problem with the AF system. The 50/1.2 sometimes has focus shift issues... but if all your lenses are acting this way, most likely something is wrong with the camera.

Try to update your firmware from here
http://www.usa.canon.c​om …os_50d#DriversA​ndSoftware

You did not provid enough information about your test scenarios, setup, configurations. Have you gone through the suggestions listed here? https://photography-on-the.net/forum/showthre​ad.php?t=857871
f1.2 gives REALLY narrow Depth of Field compared to f2.8.

cfcRebel wrote in post #13699057
You did not provid enough information about your test scenarios, setup, configurations. Have you gone through the suggestions listed here? https://photography-on-the.net/forum/showthre​ad.php?t=857871
f1.2 gives REALLY narrow Depth of Field compared to f2.8.

I understand that at f1.2 the DF is very thin but why does the camera focus so well and the images are so sharp when I am close (less than 5 ft) to the subjects. In fact DF is much thinner when you move closer to the subjects right? and get thicker when you are far away. Shouldn't I get better focus and clear images with more DF, far away from the subjects?

I will try to post the images.

Some images definitely would help.

wrxrocks wrote in post #13700040
....In fact DF is much thinner when you move closer to the subjects right? and get thicker when you are far away. Shouldn't I get better focus and clear images with more DF, far away from the subjects?

RIght, but were you shooting the "same" subject within 5 feet, and then beyond 5 feet? Keep in mind how big or tiny your subject renders in the entire frame, makes a difference. Again, post some samples would help us help you.