@Streker26 wrote:
I am a little confused. You've made a good argument to use Servo but in order to do so with focus priority one must choose a certain case setting? I don't have my camera in front of me but I thought that was another menu. What case setting do you use when in Servo to not fire the shutter in AIServo unless the camera focus is acheived?
The shutter control setting is called Image Priority, and it is found in the AF2 menu, not the AF1 Case Menu.
If you are in AI Servo mode, then Case settings apply. The individual tracking parameters made available in the case settings allow you to adjust the tracking behavior of the camera. The different Cases are simply a preset. They are what the engineers have come up with for different shooting scenarios. You can change them however you wish.
Be aware that Case settings adjust tracking behavior, and have little to nothing to do with actual focusing and subject acquisition. Case settings apply when you are tracking a subject in the viewfinder, and are using Continuous drive mode.
It is not clear to me how the Case settings would apply if you are in Single Shot drive mode. It would seem that they would not apply. It is not clear how the 1st Image Priority setting would apply in Single Shot drive mode, if at all. There seems to be an underlying assumption that if you are using AI Servo, then you also using Continuous Drive mode.
If you are using AI Servo with Single Shot drive mode, it is not clear what impact, if any, the 1st Image Priority setting would have. Based on my experience, it does seem to have an impact on how the camera behaves in this scenario. The camera will acquire a subject, and then continuously track it until you fully press the shutter. If you set 1st Image Priority to Focus, then the camera does seem to acquire a focus lock prior to activating the shutter.
Keep in mind, not every lens is responsive enough, or focuses fast enough, to be useful in AI Servo mode when used with a camera with a high frame rate. In this case, you really need to set Image Priority to Focus, so that the camera will wait for the lens to acquire a focus lock.
It is not clear to me how the Case settings would apply if you are in Single Shot drive mode. It would seem that they would not apply. It is not clear how the 1st Image Priority setting would apply in Single Shot drive mode, if at all. There seems to be an underlying assumption that if you are using AI Servo, then you also using Continuous Drive mode.
@Waddizzle wrote:
@Streker26 wrote:
I am a little confused. You've made a good argument to use Servo but in order to do so with focus priority one must choose a certain case setting? I don't have my camera in front of me but I thought that was another menu. What case setting do you use when in Servo to not fire the shutter in AIServo unless the camera focus is acheived?
The shutter control setting is called Image Priority, and it is found in the AF2 menu, not the AF1 Case Menu.
If you are using AI Servo with Single Shot drive mode, it is not clear what impact, if any, the 1st Image Priority setting would have. Based on my experience, it does seem to have an impact on how the camera behaves in this scenario. The camera will acquire a subject, and then continuously track it until you fully press the shutter. If you set 1st Image Priority to Focus, then the camera does seem to acquire a focus lock prior to activating the shutter.
The case settings apply to AIServo in single shot drive mode or multishot drive mode, in single shot drive mode they control the subject tracking of the subject while the shutter is half pressed.
If you are using AI Servo with Single Shot drive mode, it is not clear what impact, if any, the 1st Image Priority setting would have.
When using AIServo and set 1st Image Prority set to Focus the camera behaves like it is in One Shot, it will not take a photo until the subject is in Focus. The difference is that AIServo will maintain focus if your subject moves between it initially obtaining focus and your fully pressing the shutter button.
FWIW, I use AIServo, Case 1, and have both first and second image priority set to Focus, I have focus start on the shutter button, I have AF ON reprogrammed to AF OFF, incase I need to focus and recompose. In that case I focus on the subject press and hold the AF ON button which locks focus, and then I recompose.
@Waddizzle wrote:One Shot mode can be used for anything, even action sports, with a fast enough shutter and the proper depth of field.
AI Servo mode is not used for “moving” subjects, per se. Lenses have a plane of perfect focus. Depending upon your aperture setting, there is some distance behind and in front of the focus plane where subjects are in “acceptable” focus. This is called DOF.
AI Servo mode is [used to] track subjects whose distance to the camera is changing. As the distance to the subject changes, the subject can move away from the focused plane, and out of the DOF. AI Servo is used to adjust the focusing distance to the subject, as the subject moves away or towards the camera, to keep the subject within an acceptable DOF, if not in perfect focus.
And a point and shoot can be used for sports because they have a huge depth of field, but, most people using a dSLR are doing so because of the subject isolation given by a shallow depth of field, or because they need a large aperture to allow enough light to be captured.
The 50mm set at f/1.4 and a subject distance of 10 feet has a 12 inch depth of field, meaning if the subect moves more than 6 inches front or back they are out of the area of acceptable focus.
