Jemini,
I had this same issue when I first got the 1DX, but it has a lot to do with technique and the AF case settings you have. Over time I raised my hit rate to nearly 90%. Here are a few suggestions which should work for 7DMkII.
1. Use the AF point cluster where the main point is the center one with 4 assists. Occasionally, depending on backgrounds and back-lighting, you will need to go to center point with dot inside (highest precision). I never use a high AF point cluster number (such as all points) for BIFs.
2. AF case - Case I with AF tracking sensitivity minus(-) 1
If you handhold, this will drop your success rate at long focal lengths (obviously). I get the highest hit rate on a wimberley system (500mm with 1.4xTC).
You can see some of the results here on eagle shots with 1DX.There is an eagle shot where he's flying head-on
I plan on doing the same settings on the 7DMKII.
I also own a 1DMKIV; It's AF system is good, but my hit rate is lower because you really need to only use the center point for BIF.
As I said, I've had to work on my technique, mostly in panning and keeping the AF point cluster on the bird. Shutter speed is the critical factor, too. I try to shoot 1/1600-1/2000 or higher (I also use Auto ISO with compensation). If the shutter approaches 1/1000 or lower, the image will begin to look soft in many cases and can be mistaken for AF performance (I tested this extensively and it's definitely camera shake even with IS because of long focal lengths).
HTH,
--dennis
I had this same issue when I first got the 1DX, but it has a lot to do with technique and the AF case settings you have. Over time I raised my hit rate to nearly 90%. Here are a few suggestions which should work for 7DMkII.
1. Use the AF point cluster where the main point is the center one with 4 assists. Occasionally, depending on backgrounds and back-lighting, you will need to go to center point with dot inside (highest precision). I never use a high AF point cluster number (such as all points) for BIFs.
2. AF case - Case I with AF tracking sensitivity minus(-) 1
If you handhold, this will drop your success rate at long focal lengths (obviously). I get the highest hit rate on a wimberley system (500mm with 1.4xTC).
You can see some of the results here on eagle shots with 1DX.There is an eagle shot where he's flying head-on
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I plan on doing the same settings on the 7DMKII.
I also own a 1DMKIV; It's AF system is good, but my hit rate is lower because you really need to only use the center point for BIF.
As I said, I've had to work on my technique, mostly in panning and keeping the AF point cluster on the bird. Shutter speed is the critical factor, too. I try to shoot 1/1600-1/2000 or higher (I also use Auto ISO with compensation). If the shutter approaches 1/1000 or lower, the image will begin to look soft in many cases and can be mistaken for AF performance (I tested this extensively and it's definitely camera shake even with IS because of long focal lengths).
HTH,
--dennis