AI SERVO
May 16, 2013 16:56:03 #
May 16, 2013 17:01:36 #
AI Servo is Canon's predictive autofocus system. The name is derived from the use of Artificial Intelligence used to predict the speed and distance of the moving subject. It greatly increases your chance of getting a sharp image when your target is moving.
May 16, 2013 17:03:11 #
May 16, 2013 17:03:35 #
James Eslinger
Loc: Kentucky
Some references say "intelligence" as in "artificial intelligence." It might just be made up???
May 16, 2013 17:19:24 #
James Eslinger wrote:
Some references say "intelligence" as in "artificial intelligence." It might just be made up???
:thumbup: :thumbup: Very good!
May 16, 2013 17:54:29 #
May 17, 2013 10:43:07 #
lindmike wrote:
Can anyone tell me what AI stands for in AI Servo?
Thanks, Mike. I have been shooting Canons for years and often wondered myself.
May 17, 2013 13:50:10 #
lindmike wrote:
Can anyone tell me what AI stands for in AI Servo?
lindmike,
AI Servo is a function of the Auto Focus option of your Canon camera.
You should have three options:
1. Single Shot.
2. AI Focus.
3. AI Servo.
In all three Auto Focus Modes the camera measures the brightness/contrast ratio of the subject under measurement.
Single Shot Focus measures and sets the focus point for each individual shutter release performed by the camera.
AI Servo continues to measure a moving target as the target moves toward, or away from the camera. AI Servo continues to set focus for each shutter release. When you press the shutter release button all the way down focus is locked at the instant the exposure is captured.
AI Focus tells the camera to select between Single Shot and AI Servo while the camera tracks a moving subject. The camera will constantly shift between these two modes until the shutter is tripped.
Michael G
May 17, 2013 15:50:58 #
Michael G,
Thank you for that excellent explanation.
I understand I should be set on AI Servo when shooting moving subjects such as my grandchildren. I'm not sure under what circumstances I should use AI Focus?
Thank you for that excellent explanation.
I understand I should be set on AI Servo when shooting moving subjects such as my grandchildren. I'm not sure under what circumstances I should use AI Focus?
May 17, 2013 15:57:58 #
lindmike wrote:
Michael G,
Thank you for that excellent explanation.
I understand I should be set on AI Servo when shooting moving subjects such as my grandchildren. I'm not sure under what circumstances I should use AI Focus?
Thank you for that excellent explanation.
I understand I should be set on AI Servo when shooting moving subjects such as my grandchildren. I'm not sure under what circumstances I should use AI Focus?
lindmike,
You are very welcome. I agree with your observation on AI Focus. The first time my camera was set on AI Focus I thought the new camera was broke. It wouldn't stop hunting for focus lock. My best guess is, it is for people who cannot decide on how to shoot a subject, and they will take whatever the camera thinks is best.
Michael G
May 17, 2013 16:04:30 #
May 17, 2013 18:26:38 #
Armadillo wrote:
lindmike, br br AI Servo is a function of the Aut... (show quote)
Question - If your shooting sports, would you use a single focus point or the matrix. And if your using BBF, would you focus once or would you keep pumping it as you followed your subject?
May 17, 2013 19:35:24 #
raymondh wrote:
Question - If your shooting sports, would you use a single focus point or the matrix. And if your using BBF, would you focus once or would you keep pumping it as you followed your subject?
If you were shooting Sports You may want to select AI Servo and Continuous Shooting, and in PP select the best action shot. Use Center Spot focus and track the action.
Tip: For sports photos know the focal length of the lens you will be using, then manually set the ISO to a value that will allow the shutter duration to be at a minimum of 1/focal length. (Focal Length=300mm, shutter duration= 1/300 (1/300sec.))
May 17, 2013 21:08:30 #
Armadillo wrote:
If you were shooting Sports You may want to select AI Servo and Continuous Shooting, and in PP select the best action shot. Use Center Spot focus and track the action.
Tip: For sports photos know the focal length of the lens you will be using, then manually set the ISO to a value that will allow the shutter duration to be at a minimum of 1/focal length. (Focal Length=300mm, shutter duration= 1/300 (1/300sec.))
Tip: For sports photos know the focal length of the lens you will be using, then manually set the ISO to a value that will allow the shutter duration to be at a minimum of 1/focal length. (Focal Length=300mm, shutter duration= 1/300 (1/300sec.))
So if I were using a 7D, I would multiply by the crop factor, 300 x 1.6 = 1/500 sec. What about IS - on or off?
May 17, 2013 22:38:41 #
raymondh wrote:
So if I were using a 7D, I would multiply by the crop factor, 300 x 1.6 = 1/500 sec. What about IS - on or off?
raymondh,
I don't know about your 7D body, and it sounds like you are figuring on an effective focal length with the crop factor figured in. If you are using a 300mm lens not made for the 7D then your result should be 1/500se. at a minimum. IS = on if hand holding. IS = off if using a tripod, or mono-pod.
If you are using a 300mm lens manufactured by Canon for the 7D then your shutter duration would be 1/350sec minimum.
Michel G
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