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Forum: Troubleshooting and Beginner Help
02-03-2016, 01:29 PM
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This could have something to do with the camera's age. I would check to see if the mirror and mirror box are clean and free of dust, as you want to be sure the AF sensor (which basically sits behind 2 mirrors) has a clear view of the scene.
I also would try using all 27 AF points. Since the 150-450mm is in the F6.7 to F8 range with the TC, you're pushing the limits of the AF system and might not get the best results with a single AF point unless you're in bright daylight.
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