... you're looking for support from the largest group of GAS enablers on the planet... wish you luck... I have one of each, kinda like a two car garage... wait, that would be cheaper, sorry... Good Luck trying to control the GAS!
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Seems to me like weight and the IS system are really the only major differences.
As someone else mentioned - that's a thin line of focus, too. On a sunny day you should be able to get away with a higher f-stop.
I've not had this problem, I don't tend to shoot sports, but I often use the expanded AF selection. Would this help maybe? It might just help if the problem is to little contrast on the white. Maybe a polarizing filter would help.
Yeah I'm not sure. Before when I was shooting sports I was using a 300 f/2.8L I IS and so therefore I was closer to the subject. This is worse as the distance from me to subject increases as well so it could just be the 300 had more contrast to detect. Either way, I missed a lot of shots and I'm at least going to have Canon check it out as I'm sending it in tomorrow.
We'll see. Thanks.
Has anyone noticed a decrease in AF accuracy on bright sunny days where your team is wearing white jerseys. I am often disappointed in the keeper rate in these situations where the camera/lens seems to focus nowhere in particular even though it says you've locked on the player. I noticed it seems to be worse with the 400 than with the 300 I used to own. Does the bright white fool the AF system? Just wondering if anyone else had some of these troubles over time. Sunday the soccer game was at 1pm and it was particularly bad. I post an example: 1st frame shows the blurry jersey and face, 2nd is better. 3rd frame I can't figure out but the "brightness" made the AF jumpy I recall. I didn't keep any of these for submission obviously.
If it's useful, it'll be in the 1Dx II.
Regarding the 1DX (I'd guess it's the same for the 5D3 having the issue too...), send it into Canon for inspection... just got mine back from CPS, shutter assembly had to be replaced.
I had an under-exposure issue on the first frame vs. your darker... shutter was sticking for the first exposure then was fine for subsequent frames. Mine would occur after the camera had "rested" for awhile, as long as I kept using it I had no issue, it was the first burst after not using the camera for a bit. I noticed it happening the first burst of the day, I was shooting a 22 day baseball tournament so I got to see it happen and could recreate it quite easily.
You describe my problem. Many thanks. Canon has to fix this with a replacement of the shutter assembly.
1Dx RAW files are better. Don't know why. I had a 1Dx and a 5D3 and sold the 5D3 and got another 1Dx. You'll love it.
With the latest FW there is a way to have both AI Servo and One-shot modes programmed to two different back-button focus buttons. I have my Af-On button as my regular AI Servo mode and I have the * button set to be one shot focus. This setting is done differently than the way you are doing with the AIServo-Oneshot switching button, which as you have found out requires it to be held down. With the other way you have a full separate button for one-shot and a separate button for servo.
You set this up in the C.Fn 5 menu under Custom Controls. You would set the shutter button to "Metering Start" and then you would set AF-On and * to "Metering and AF start", select it and then press the INFO button for the "Detail Set". This will give you a menu with 4 options: AF start point, AI servo AF characteristics, AF mode and 14FPS super high speed mode. You only need to make changes to the * button as the AF-On will stay at default values. For the * button I go under "AF mode" and select "ONE SHOT".
Alternatively you could use this way to set up two different AI Servo modes on the two different buttons.