I have owned the 7D for a year with no problems using the older EF-300mm f/2.8 fixed focus lens. Two weeks ago I purchased the new 7D Mark ii hoping to use this newer camera exclusively with the 300mm. I must have taken nearly a thousand shots with the 7D Mark ii and not a single photo was in sharp focus. The settings for both cameras were nearly identical [approx. 1/3000 @ f/3.2 ISO 250] and my tests using both cameras were conducted at the same time. I take horse race photos so I alternated cameras / lenses between races. No doubt about it. The 7D took nearly perfect photos while the 7D Mark ii was off every single shot!
I also tested both cameras with my 70-200mm IS ii f/2.8 and there was no obvious differences between the images. So the issue appears to focus (literally!) on the 300mm.
Fortunately B+H honored their 30-day return policy so I'm back to having to switch three lenses on one camera.
Someone said the problem might have to do with the new 69 points of focus in the 7D Mark ii but I cannot find any verification of this.
Any ideas what's going on here?