Ai servo Continuous Autofocus Canon Eos R
Confused: al servo vs continuous autofocus
kb1dqh • Forum Member • Posts: 83
Confused: al servo vs continuous autofocus
I have searched and read, but I still don't get it. For something like small head movements, i.e. following a baby, which makes more sense and why? With continuous AF, what happens if I compose and move the camera, does it lock to the original AF point? I'll do some testing, but would be great to understand a complete answer on the differences.
Why is continuous AF even an option in al servo mode - sounds redundant although I'm sure it's not.
nnowak • Veteran Member • Posts: 8,686
Re: Confused: al servo vs continuous autofocus
9
Yes, the naming is confusing. Normally, you would half press the shutter button to tel the the camera to run an AF cycle. If you removed your finger from the shutter button, the AF cycle would stop. With "One-Shot", a half press would tell the camera to run one AF cycle and then stop. With "AI Servo", the camera will keep running the AF cycle as long as the shutter button is half pressed. "AI Servo" is the mode you would use if you or your subject are moving as it will continuously update the AF.
Now, for that "Continuous AF". If you enable "Continuous AF", the camera will run the AF cycle as long as the camera is turned on. No half press of the shutter is needed to start an AF cycle. You camera could be hanging around your neck pointed at the ground, and "Continuous AF" would keep refocusing the lens. Why anyone would want to use "Continuous AF" is a mystery. Why it is enabled by default makes even less sense.
Short answer: turn off "Continuous AF" as your first action with any new M system camera and then set "One-Shot" or "AI Servo" as needed.
Re: Confused: al servo vs continuous autofocus
2
kb1dqh wrote:
I have searched and read, but I still don't get it. For something like small head movements, i.e. following a baby, which makes more sense and why? With continuous AF, what happens if I compose and move the camera, does it lock to the original AF point? I'll do some testing, but would be great to understand a complete answer on the differences.
Why is continuous AF even an option in al servo mode - sounds redundant although I'm sure it's not.
Continuous AF was something that was introduced with the original M, I think. At least that's the first camera I had that featured it. Everything I read said to disable it right away, which I did. Continuous AF keeps trying to focus all the time that the camera is on, even when you're not pressing the shutter button or AF-ON button. The idea, I think, is that you will always be close to focused on what you want, so there won't be so much work for the camera to do when you do press the shutter button. It might have been marginally useful on the original M, which had quite slow AF (though it never really bothered me), but it seems totally unnecessary on current models with fast AF. It also uses more battery. I would recommend just turning it off. Unless someone else can give you (and me) a good reason for keeping it on.
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lumenite • Senior Member • Posts: 1,187
Re: Confused: al servo vs continuous autofocus
1
kb1dqh wrote:
I have searched and read, but I still don't get it. For something like small head movements, i.e. following a baby, which makes more sense and why? With continuous AF, what happens if I compose and move the camera, does it lock to the original AF point? I'll do some testing, but would be great to understand a complete answer on the differences.
It depends on what kind of AF point is selected. If AF point is fixed at a specific point within the screen, the focus will move when you move the camera view. If AF point is fixed at a specific object such as face, the focus will follow it while you move the view.
Why is continuous AF even an option in al servo mode - sounds redundant although I'm sure it's not.
With continuous AF on, the camera always tries to do AF even when the shutter is not pressed halfway. However, when continuous AF is off, the user can focus only when he or she wants to focus by pressing the shutter halfway.
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OP kb1dqh • Forum Member • Posts: 83
Re: Confused: al servo vs continuous autofocus
Thank you both! Glad I asked.
Alexsfo • Senior Member • Posts: 2,359
Re: Confused: al servo vs continuous autofocus
thank you for the tip. I will turn off continuous AF, seems like a waste of battery life.
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Andy01 • Veteran Member • Posts: 5,029
Re: Confused: al servo vs continuous autofocus
Alexsfo wrote:
thank you for the tip. I will turn off continuous AF, seems like a waste of battery life.
I think that Continuous AF was a Canon "invention" to assist with the woefully slow AF of the earlier M bodies - to try to get them in the ballpark before the real AF starts.
IMO it is not required for the newer (M5 and later) bodies. It just reduces an already poor battery life.
Colin
Canon EOS M5 Canon 6D Mark II Canon EF 100mm F2.8L Macro IS USM Canon EF-M 22mm f/2 STM Canon EF 35mm F2 IS USM +5 more
Re: Confused: al servo vs continuous autofocus
nnowak wrote:
Yes, the naming is confusing. Normally, you would half press the shutter button to tel the the camera to run an AF cycle. If you removed your finger from the shutter button, the AF cycle would stop. With "One-Shot", a half press would tell the camera to run one AF cycle and then stop. With "AI Servo", the camera will keep running the AF cycle as long as the shutter button is half pressed. "AI Servo" is the mode you would use if you or your subject are moving as it will continuously update the AF.
Now, for that "Continuous AF". If you enable "Continuous AF", the camera will run the AF cycle as long as the camera is turned on. No half press of the shutter is needed to start an AF cycle. You camera could be hanging around your neck pointed at the ground, and "Continuous AF" would keep refocusing the lens. Why anyone would want to use "Continuous AF" is a mystery. Why it is enabled by default makes even less sense.
Short answer: turn off "Continuous AF" as your first action with any new M system camera and then set "One-Shot" or "AI Servo" as needed.
Thanks for the great explanation. I already had all these settings enabled, but couldn't remember why, LOL!
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