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#1
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Are many autofocus points nessesary??
Hi,
I was wondering, what is the advantage of many autofocus points? When I use autofocus on my 400D I sometimes have to hunt for a focus point to focus at a particular point.. I often switch to manual selection of which point that should be focused on... Is there a draw back to doing this? why have 9 points? I think most of the time it tends to focus on odd places like the hair or ears of a person, when I really want to focus on the eyes.. Any clearafication is appreciated Soren |
#2
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Are many autofocus points nessesary??
"Soren" schreef in bericht
oups.com... Hi, I was wondering, what is the advantage of many autofocus points? When I use autofocus on my 400D I sometimes have to hunt for a focus point to focus at a particular point.. I often switch to manual selection of which point that should be focused on... Is there a draw back to doing this? why have 9 points? I think most of the time it tends to focus on odd places like the hair or ears of a person, when I really want to focus on the eyes.. I always use just the middle point, and when i want to focus on something that's not in the middle i focus on it and change the position after that, holding the shutter-release half pressed. maybe oldfashioned, but works easiest. Note that you have to use the appropiate setting: hence no servo-focussing. Rutger -- http://www.flickr.com/photos/zwaarddrager |
#3
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Are many autofocus points nessesary??
"Soren" wrote in message oups.com... Hi, I was wondering, what is the advantage of many autofocus points? When I use autofocus on my 400D I sometimes have to hunt for a focus point to focus at a particular point.. I often switch to manual selection of which point that should be focused on... Is there a draw back to doing this? why have 9 points? I think most of the time it tends to focus on odd places like the hair or ears of a person, when I really want to focus on the eyes.. Any clearafication is appreciated Soren Yes. 5, 7, 9, 11 point focussing is all part of the sales spiel for the techno buyers who must have the highest spec. Of even less importance than the ever increasing number of pixels. If you know what you are doing, 1 focus point is all you need. I would advocate only ever using 1 at a time, but it is sometimes convenient to select an off centre point, so there is some justification for having more than 1. Roy G |
#4
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Are many autofocus points nessesary??
Rutger wrote:
"Soren" schreef in bericht oups.com... Hi, I was wondering, what is the advantage of many autofocus points? When I use autofocus on my 400D I sometimes have to hunt for a focus point to focus at a particular point.. I often switch to manual selection of which point that should be focused on... Is there a draw back to doing this? why have 9 points? I think most of the time it tends to focus on odd places like the hair or ears of a person, when I really want to focus on the eyes.. I always use just the middle point, and when i want to focus on something that's not in the middle i focus on it and change the position after that, holding the shutter-release half pressed. maybe oldfashioned, but works easiest. Note that you have to use the appropiate setting: hence no servo-focussing. Rutger Many focus points are needed to be able to compose freely and have the focal point where you want it. For example, when imaging wildlife or people, a key to a great photo is focusing on the eyes. Here is an example: http://www.clarkvision.com/galleries...0240b-700.html I used manual focus point selection, and AI servo. The AI servo tracks focus as the subject moves toward or away from the camera, and even predicts the rate of change and moves the focus to the predicted point when the shutter actually fires, as opposed to when you press the button, thus compensating for the shutter lag. If you just use center focus all the time, focus would not be on the eyes, for example, in this shot: http://www.clarkvision.com/galleries...8463b-700.html During action, as I follow the action, I manually move the focus point to keep an AF sensor on the eyes while maintaining the composition I want. I use a 1D Mark II which has 45 AF points. I wish it had more AF points! Roger |
#5
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Are many autofocus points nessesary??
On Apr 28, 6:59 am, "Rutger" wrote:
"Soren" schreef in ooglegroups.com... Hi, I was wondering, what is the advantage of many autofocus points? When I use autofocus on my 400D I sometimes have to hunt for a focus point to focus at a particular point.. I often switch to manual selection of which point that should be focused on... Is there a draw back to doing this? why have 9 points? I think most of the time it tends to focus on odd places like the hair or ears of a person, when I really want to focus on the eyes.. I always use just the middle point, and when i want to focus on something that's not in the middle i focus on it and change the position after that, holding the shutter-release half pressed. maybe oldfashioned, but works easiest. Note that you have to use the appropiate setting: hence no servo-focussing. Rutger --http://www.flickr.com/photos/zwaarddrager I agree with Rutger, and find that its easier to do it that way than to select which focus point I want to use. Eric |
#6
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Are many autofocus points nessesary??
On Apr 28, 2:33 pm, "Roger N. Clark (change username to rnclark)"
wrote: Rutger wrote: "Soren" schreef in bericht roups.com... Hi, I was wondering, what is the advantage of many autofocus points? When I use autofocus on my 400D I sometimes have to hunt for a focus point to focus at a particular point.. I often switch to manual selection of which point that should be focused on... Is there a draw back to doing this? why have 9 points? I think most of the time it tends to focus on odd places like the hair or ears of a person, when I really want to focus on the eyes.. I always use just the middle point, and when i want to focus on something that's not in the middle i focus on it and change the position after that, holding the shutter-release half pressed. maybe oldfashioned, but works easiest. Note that you have to use the appropiate setting: hence no servo-focussing. Rutger Many focus points are needed to be able to compose freely and have the focal point where you want it. For example, when imaging wildlife or people, a key to a great photo is focusing on the eyes. Here is an example: http://www.clarkvision.com/galleries.../lion.c01.23.2... I used manual focus point selection, and AI servo. The AI servo tracks focus as the subject moves toward or away from the camera, and even predicts the rate of change and moves the focus to the predicted point when the shutter actually fires, as opposed to when you press the button, thus compensating for the shutter lag. If you just use center focus all the time, focus would not be on the eyes, for example, in this shot: http://www.clarkvision.com/galleries.../lion.c01.20.2... During action, as I follow the action, I manually move the focus point to keep an AF sensor on the eyes while maintaining the composition I want. I use a 1D Mark II which has 45 AF points. I wish it had more AF points! Roger Thanks for all the answers everyone! So multiple AF points is really good if you use the servo and track a motion and want to maintain a certain composition. But for still photos I can use the center point and move the camera (as I do now) without getting into trouble. Thanks for the nice examples Roger, great pictures by the way! Soren |
#7
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Are many autofocus points nessesary??
Soren writes:
certain composition. But for still photos I can use the center point and move the camera (as I do now) without getting into trouble. Canon have recomended against this, and have said that for best AF accuracy you should NOT focus and re-frame, but to use the AF point in the best position. |
#8
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Are many autofocus points nessesary??
In article , Paul Repacholi
wrote: Canon have recomended against this, and have said that for best AF accuracy you should NOT focus and re-frame, but to use the AF point in the best position. They're full of ****. |
#9
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Are many autofocus points nessesary??
On Sat, 28 Apr 2007 12:21:00 GMT, "Roy G"
wrote: "Soren" wrote in message roups.com... Hi, I was wondering, what is the advantage of many autofocus points? When I use autofocus on my 400D I sometimes have to hunt for a focus point to focus at a particular point.. I often switch to manual selection of which point that should be focused on... Is there a draw back to doing this? why have 9 points? I think most of the time it tends to focus on odd places like the hair or ears of a person, when I really want to focus on the eyes.. Any clearafication is appreciated Soren Yes. 5, 7, 9, 11 point focussing is all part of the sales spiel for the techno buyers who must have the highest spec. Of even less importance than the ever increasing number of pixels. If you know what you are doing, 1 focus point is all you need. I would advocate only ever using 1 at a time, but it is sometimes convenient to select an off centre point, so there is some justification for having more than 1. Roy G That's true for static subjects etc. but for sports/photojournalism etc. modern cameras use the multiple off-centre focus points to (atempt to) lock onto a moving subject and keep it in focus even if it is not kept within the same position within the frame. |
#10
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Are many autofocus points nessesary??
Paul Repacholi wrote:
Soren writes: certain composition. But for still photos I can use the center point and move the camera (as I do now) without getting into trouble. Canon have recomended against this, and have said that for best AF accuracy you should NOT focus and re-frame, but to use the AF point in the best position. They are wrong. Using many focus points can lead to the classic sharp wall behind the 2 foreground people's blurred faces. Morton |
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