Melih Ozbek
Well-known member
How many of your cameras switched to AI Servo while just panning or a subject passing from left to right?
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How do you disable AI Servo?
- Thread starter johnrweb
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simpleton176979
Forum Enthusiast
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David Barker91965
Senior Member
The point Daniella (in particular) is making is that the metering is too strongly biassed towards the area immediately adjacent to the (single) focus point.
It would be more useful to Daniella (and others) if the focus point could be specific but the metering more general.
That's if I've understood correctly.
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David Barker
SFJP
Senior Member
Well, these engineers are Japanese, and japanese have an amazing ability to master complicated ergonomy. Try to read or write a language using 4 different kinds of characters, among which the chinese ideograms... When I read the 300 D user's manual recap of the metering and AF modes in the various settings, I thought it was a bad joke. I believe that for a japanese thiis is on the contrary quite easy to grasp and memorize.
SFJP
http://www.pbase.com/sfjp
--I bet those engineers at Canon are young brains...not very bright
though))
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I am not an English native speaker!
http://www.pbase.com/zylen
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SFJP
http://www.pbase.com/sfjp
David Barker91965
Senior Member
Tom - there must be a variation between cameras, which would also account for the varying reports early on about the delay while waiting for AI servo to kick in.
I remember quite a bit of anxiety mentioned about this, with some early owners reporting no servo activity despite contrived experiments with children running towards the camera etc. yet others gave reassurances that the delay before the focus mode changed was negligible. Both descriptions couldn't be true then or now unless there is a considerable variation between cameras (or a difference in setup that hasn't been identified yet).
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David Barker
jlo185420
Member
1. Focus on whatever you want.
2. Wait for the focus conformation light in the view finder to come on. (This should be prettry fast depending on what lens you are using.) If you recompose before this, the camera is still trying to achieve sharp focus and therefore would focus on the "wrong" part of the image.
3. Recompose and shoot.
From here, the only way that I can have the AI servo kick in is to play with the focus ring (can only do this with ring type USM lens). And this is how I do it when shooting action.
Hope it works for you.
jlo
2. Wait for the focus conformation light in the view finder to come on. (This should be prettry fast depending on what lens you are using.) If you recompose before this, the camera is still trying to achieve sharp focus and therefore would focus on the "wrong" part of the image.
3. Recompose and shoot.
From here, the only way that I can have the AI servo kick in is to play with the focus ring (can only do this with ring type USM lens). And this is how I do it when shooting action.
Hope it works for you.
jlo
You know, this strikes me as something thar really warrants a letter writing campaign to Canon. Yes?
I absolutely hate the AI focus mode. It ruins shots, and it renders Canon's own lens feature of all-time manual focusing useless (available on the 28-135 IS USM lens, but redered useless on the 300d).
The vast bulk of photograhers have experience focusing in the center and recomposing. This is not some minor thing; it gets in the way of the fundamnetal photography workflow of 300 users.
I absolutely hate the AI focus mode. It ruins shots, and it renders Canon's own lens feature of all-time manual focusing useless (available on the 28-135 IS USM lens, but redered useless on the 300d).
The vast bulk of photograhers have experience focusing in the center and recomposing. This is not some minor thing; it gets in the way of the fundamnetal photography workflow of 300 users.
Sandman
Forum Pro
Shaun Braley,
Are you certain of this? I think it does. I think the camera switches to a "partial metering."
Check this out and let me know your thoughts:
http://www.pbase.com/sandman3/rebel_tests
This is one reason I am an advocate of using auto-detection of focus targets, rather than manually selecting the center one, as has been advocated on the forums. I am under the impression that the camera meters MUCH more accurately when the camera is permitted to auto select. Now, if I have trouble on the second or third try to get my intended target in focus to no avail, I am quick to manually select a single focus point. But after the shot, this goes right back to all focus points active.
And thanks to this thread, I've found another reason to use all focus points rather than the center focus target: no problems with the A1 Servo kicking in!
Cheers,
jim
galleries at: http://www.pbase.com/sandman3
Are you certain of this? I think it does. I think the camera switches to a "partial metering."
Check this out and let me know your thoughts:
http://www.pbase.com/sandman3/rebel_tests
This is one reason I am an advocate of using auto-detection of focus targets, rather than manually selecting the center one, as has been advocated on the forums. I am under the impression that the camera meters MUCH more accurately when the camera is permitted to auto select. Now, if I have trouble on the second or third try to get my intended target in focus to no avail, I am quick to manually select a single focus point. But after the shot, this goes right back to all focus points active.
And thanks to this thread, I've found another reason to use all focus points rather than the center focus target: no problems with the A1 Servo kicking in!
Cheers,
jim
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galleries at: http://www.pbase.com/sandman3
Tommy_T
Forum Enthusiast
or any other camera to that end
in fact, when i got my DR a couple of months ago, i made an observation how bad it is comparing to almost any SLR and one of my points was exactly that - sometimes you cannot recompose the shot. gee, i was called a ****** and troll and whatever back then by the same people who are replying to your post now and agreeing that there is a problem with AI Focus.
in fact, when i got my DR a couple of months ago, i made an observation how bad it is comparing to almost any SLR and one of my points was exactly that - sometimes you cannot recompose the shot. gee, i was called a ****** and troll and whatever back then by the same people who are replying to your post now and agreeing that there is a problem with AI Focus.
David Barker91965
Senior Member
Or to put it more succinctly, focus, recompose and shoot! I think that's what these other guys are doing, it's just that it's not working 100% for them. FWIW 'your' method seems to work for me, but I admit that I haven't had time to use my camera that much (grrr) so I can only accept other peoples' observations. It's another 300D mystery.
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David Barker
Daniella68313
Forum Pro
well..it all depends what focusing point the camera will use in 7 points focusing..if it activate all 7 points, you do get somethign like evaluative..if it pick up only one, then you get partial meetering.
When you use only one point focusing by manual selection of the focusing point..then forget about evaluative..it is gone bye bye.
I am not an English native speaker!
http://www.pbase.com/zylen
http://www.photosig.com/go/users/userphotos?id=26918
When you use only one point focusing by manual selection of the focusing point..then forget about evaluative..it is gone bye bye.
--
I am not an English native speaker!
http://www.pbase.com/zylen
http://www.photosig.com/go/users/userphotos?id=26918
john_dc wrote:
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When an updated 10D is released with a smaller crop factor, I think a lot of D300's will be for sale and I think that is just what Canon wants...
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Agreed, Canon please turn off AI Focus in the manual modes or at least M mode. So many OOF shots with this camera where AI Servo kicked in or it was wanted and it did not. Forcing AI Servo using Sports mode results in over saturated, over contrasted shots.
When an updated 10D is released with a smaller crop factor, I think a lot of D300's will be for sale and I think that is just what Canon wants...
Daniella68313
Forum Pro
that's exactly what I meant. If I use the 7 points focus and the camera pick up points that are spread, lets say one on the left and one of the right, then I get evaluative meetering. If the camera would pick up onle the point on the right, then I get partial.
But since I am using the manualy selected central focusing point, I always get exposure that is strongly weithted toward the center. I don't want to use 7 points focus...it does not focus where I want it to be, but I would like to be able to get evaluative no matter what focusing point I use.
My only work around so far is to pay attention to focus right on the edge of dark/light areas. I must constantly pay attention to where exactly I focus on a contrasty subject...a pain in the ass!
I am not an English native speaker!
http://www.pbase.com/zylen
http://www.photosig.com/go/users/userphotos?id=26918
But since I am using the manualy selected central focusing point, I always get exposure that is strongly weithted toward the center. I don't want to use 7 points focus...it does not focus where I want it to be, but I would like to be able to get evaluative no matter what focusing point I use.
My only work around so far is to pay attention to focus right on the edge of dark/light areas. I must constantly pay attention to where exactly I focus on a contrasty subject...a pain in the ass!
--
I am not an English native speaker!
http://www.pbase.com/zylen
http://www.photosig.com/go/users/userphotos?id=26918
Chris MacClellan
Leading Member
I've had my DRebel for a month now and have never seen the AI Servo kick in. What mode does the camera have to be in?? I always shoot in "P" mode with center point selected and in single shot mode. I was even out at the RC Air field the other day and took about 50 pictures of a fast moving plane and the AI servo didn't kick in. Do you have to be in burst mode??
Mac
Mac
Daniella68313
Forum Pro
when I use the 7 points focusing, I must be very lucky for the camera to pick up what I want it to pick up. MOst of my shots then come out with my main subject blurred.
I am not an English native speaker!
http://www.pbase.com/zylen
http://www.photosig.com/go/users/userphotos?id=26918
this is an idea..although by the time you shift this, your photographic opportunity might be gone. it is the case for flying birds or other fast moving target.
really?
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I am not an English native speaker!
http://www.pbase.com/zylen
http://www.photosig.com/go/users/userphotos?id=26918
Daniella68313
Forum Pro
YES!
yes that is a real problem and this feature cannot really be used on the 300d..a pitty. I called Canon on the phone and they admitted that the 300d will not work with full time manual focus.
yes it does. It is not only crippling the camera, it is impairing on its ability to work normaly.
--
I am not an English native speaker!
http://www.pbase.com/zylen
http://www.photosig.com/go/users/userphotos?id=26918
David Barker91965
Senior Member
OK - do you have the kit lens? Put the camera in P mode, stand about 6 feet from something with plenty of contrast and half-press until focus locks on. As soon as it does, start moving towards the subject. You'll hear the auto-focus motor stuttering. That's the AI servo kicking in.
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David Barker
Daniella68313
Forum Pro
ain't that loughable? If nobody complains...nothing will be changed.
--
I am not an English native speaker!
http://www.pbase.com/zylen
http://www.photosig.com/go/users/userphotos?id=26918
Daniella68313
Forum Pro
no, you just have to ask God to make it kick for you..If God hear you than he might consider it a serious matter and grant you your wish..but more than likely he will think that your focusing problem is not important compare to the famine in the world and attend other matters...
--
I am not an English native speaker!
http://www.pbase.com/zylen
http://www.photosig.com/go/users/userphotos?id=26918
Sandman
Forum Pro
Daniella,
Have you tried moving the camera just a tad and try the auto focus a second time? I've been amazed at the number of times I've been able to get a focus lock on the second try, with just slight movement of the camera. I know this is not scientific, but it is almost as if the camera "knows" that I don't want the first selection and tries to give me a second.
And I am under the impression that when permitting auto selection of all focus targets, the evaluative metering remains, even if the camera only selects one focus point. In other words, I think there is a difference in metering mode if YOU select one focus target vs permitting the camera to select one focus target. In the former, i think you force the camera into "partial" metering, whereas in the latter the evaluative metering persists.
I'll see if i can "test" this in the coming days.
And of course, some shooting conditions are more demanding than others regarding focus. When I am shooting buterflies, I usually have to manually select a focus point, since i want to focus on the eye. Also, in extreme close-up work, focus lock and recomposing is not an option! (all of your images would be OOF). So I usually select target 2 or 6 and I'm good to go. BUT, I have to be very careful about the metering, much more so than when all focus points are active. And when you are shooting wildlife, etc, probably the center focus target selected is a good idea, again if you are aware of the special metering demands of the shot.
Cheers,
jim
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galleries at: http://www.pbase.com/sandman3
Have you tried moving the camera just a tad and try the auto focus a second time? I've been amazed at the number of times I've been able to get a focus lock on the second try, with just slight movement of the camera. I know this is not scientific, but it is almost as if the camera "knows" that I don't want the first selection and tries to give me a second.
And I am under the impression that when permitting auto selection of all focus targets, the evaluative metering remains, even if the camera only selects one focus point. In other words, I think there is a difference in metering mode if YOU select one focus target vs permitting the camera to select one focus target. In the former, i think you force the camera into "partial" metering, whereas in the latter the evaluative metering persists.
I'll see if i can "test" this in the coming days.
And of course, some shooting conditions are more demanding than others regarding focus. When I am shooting buterflies, I usually have to manually select a focus point, since i want to focus on the eye. Also, in extreme close-up work, focus lock and recomposing is not an option! (all of your images would be OOF). So I usually select target 2 or 6 and I'm good to go. BUT, I have to be very careful about the metering, much more so than when all focus points are active. And when you are shooting wildlife, etc, probably the center focus target selected is a good idea, again if you are aware of the special metering demands of the shot.
Cheers,
jim
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galleries at: http://www.pbase.com/sandman3
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