Here is a sequence I took using pre capture. I am using both the 400 DO II lens and the 500 II lens. Took several thousand photos in every possible angle and speed of the bird. This sequence is one of the more simple, I thought the pics should have been in focus. EVERY shot I took using the two lenses were out of focus when using pre-capture. You can see the AF is lagging very bad.
Oddly enough if I turned off pre-focus, when the bird started to move most all were in focus. Not only that but on the 400 and 500 the AF speed was so fast I could actually feel the torque. Something I have never noticed before. I even got some swallows in flight shots with no problem.
My thinking at this point is the camera gets bogged down with information and gets sluggish. Or Canon is stopping the older EF lenses from working properly in pre-capture.
Next, I need to rent the 100-300mm lens and see if I get the same results.
A few thoughts, if you are going to use pre-capture. Try to get a huge depth of field.
There are many reasons to get the R5m2, but if using these two lenses for birding it is a joke. A work in progress for sure.
Sep 14, 2025 at 10:11 AM
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