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04/23/2004 10:04:28 AM · #1 |
Can anyone explane to me how I do it in the Rebel.
Can´t find it in the manual. |
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04/23/2004 10:31:17 AM · #2 |
I did a Google search and this came up....
//www.photo.net/bboard/q-and-a-fetch-msg?msg_id=007znI&unified_p=1
It appears that the camera will switch automatically to ai servo if movement is detected.
Here's my complete search results.
//www.google.ca/search?q=%22ai+servo%22+rebel&ie=UTF-8&oe=UTF-8&hl=en
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04/23/2004 10:56:17 AM · #3 |
| This feature is not on the rebel. |
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04/23/2004 11:00:43 AM · #4 |
Originally posted by ellamay:
This feature is not on the rebel. |
Actually it is, it's just automatic (at least that's what I've read).
Quote from specs on dpreview:
AF modes No selection available, depends on exposure mode:
â€Â¢ AI Focus AF (Auto, P, Tv, Av, M, Flash Cancel)
â€Â¢ One shot AF (Portrait, Landscape, Macro, Night Scene, A-DEP)
â€Â¢ AI Servo AF (Sports)
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04/23/2004 11:14:12 AM · #5 |
In the normal shooting modes, P, Av, Tv, M... you are stuck with Ai-focus mode as others have mentioned. I find this very limiting as the camera rarely ever knows when it is appropriate to use Ai-Servo or Single Focus mode. The thing I have been resorting to is using the camera in sports mode. In sports mode the camera only uses Ai-Servo mode but you can't control exposure compensation, ISO or image quality manually with sports mode. It isn't ideal but it is better than nothing.
Greg |
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04/23/2004 11:36:35 AM · #6 |
Note that in AI Servo mode, the camera switches to "shutter priority", meaning that the shutter will fire whether focus is achieved or not. This is as distinguished from one shot mode, where the camera won't fire at all unless it thinks it has focus.
Somebody who sets their camera to AI Servo all the time and only takes "single shots" will often have blurry, out-of-focus pictures because of this. This was a common explanation for the 10D "focus issues" when the 10D first came out. Everybody set their camera to "AI Servo" because it "continuously focuses", and people thought that would be better than "one shot". The problem was that because of the "shutter priority" nature of the "AI Servo", there were many out-of-focus shots, especially with lenses that focus slowly (i.e., non-USM lenses). |
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04/23/2004 11:45:13 AM · #7 |
Originally posted by dadas115:
In the normal shooting modes, P, Av, Tv, M... you are stuck with Ai-focus mode as others have mentioned. I find this very limiting as the camera rarely ever knows when it is appropriate to use Ai-Servo or Single Focus mode. The thing I have been resorting to is using the camera in sports mode. In sports mode the camera only uses Ai-Servo mode but you can't control exposure compensation, ISO or image quality manually with sports mode. It isn't ideal but it is better than nothing.
Greg |
So if you try to focus and recompose the camera is going to keep refocusing for you in Av, Tv, P and M modes ? Wow.
I think for me this would make the camera basically unusable, or I'd have to relearn a whole different style of shooting.
Really no ability to do one shot focusing in any of those modes ?
Message edited by author 2004-04-23 11:46:46.
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04/23/2004 11:47:51 AM · #8 |
Originally posted by Gordon:
So if you try to focus and recompose the camera is going to keep refocusing for you in Av, Tv, P and M modes ? Wow.
I think for me this would make the camera basically unusable, or I'd have to relearn a whole different style of shooting. |
Yep, and yep, it is very annoying. It becomes quite a pain for macros/closeups sometimes, when you want a non-centred focus. |
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04/23/2004 11:54:24 AM · #9 |
Thanks for the reply everyone. Your links were useful cpanaioti:
It seems that in the creative zone the camera makes it´s one decition but this hasn´t (still, just recently got it) been a problem for me. I mostly use the centerpoint for focusing and then move it to the sides or up and down to change the frame without any problems.
In the Google threat it seems that it´s possible to use the DOF button to lock the camera in singel shot AF mode and thereby avoid unwanted AI servo. But ofcourse it would have been better to be able to control it with a single buttun if you want it or not. |
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04/23/2004 11:55:25 AM · #10 |
Originally posted by garlic:
Can anyone explane to me how I do it in the Rebel.
Can´t find it in the manual. |
You can trick the camera into switching to AI Servo, but it's tricky. You can't do it with all lenses, but it works best if you have a lens with FTM (full time manual) focusing, such as the Canon 28-105 USM II. While you half press the shutter to get it's focus, you just nudge the focus ring, and the camera will go into AI Servo.
I have not really had the occasion to try it out in a photographic setting, but I did manage to make it work just fooling around at home.
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04/23/2004 11:56:54 AM · #11 |
I just switch to MF on the lens after the camera achieves its focus, which stops it changing the focus.
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04/23/2004 12:03:18 PM · #12 |
Originally posted by Konador:
I just switch to MF on the lens after the camera achieves its focus, which stops it changing the focus. |
Of course.
Message edited by author 2004-04-23 12:03:31. |
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04/23/2004 12:07:04 PM · #13 |
Originally posted by Konador:
I just switch to MF on the lens after the camera achieves its focus, which stops it changing the focus. |
I'm pretty surprised. I had been considering a 300D, but if all the modes where you can control exposure are all AI-servo that's pretty bad.
Message edited by author 2004-04-23 12:08:11.
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04/23/2004 12:10:07 PM · #14 |
Originally posted by Konador:
I just switch to MF on the lens after the camera achieves its focus, which stops it changing the focus. |
You beat me to it...
I used this a few times on my film SLR in Kenya a couple of weeks back - it DOES allow me to recompose but sometimes it was easier to achieve focus and then flick to MF to retain it. One time I was photographing a group of cheetahs (Kike and her cubs if anyone watches Big Cat Diary) and she was sitting in long grass. Although I still had a great view of her my camera found it very hard to focus on her rather than the grass. Once I achieved focus I switched into MF and then just continued to adjust manually from that point on if I needed to. Much easier than wasting time listening to the whirring AF motors try and deal with the moving grass!
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04/23/2004 12:11:23 PM · #15 |
Originally posted by Gordon:
Originally posted by dadas115:
In the normal shooting modes, P, Av, Tv, M... you are stuck with Ai-focus mode as others have mentioned. I find this very limiting as the camera rarely ever knows when it is appropriate to use Ai-Servo or Single Focus mode. The thing I have been resorting to is using the camera in sports mode. In sports mode the camera only uses Ai-Servo mode but you can't control exposure compensation, ISO or image quality manually with sports mode. It isn't ideal but it is better than nothing.
Greg |
So if you try to focus and recompose the camera is going to keep refocusing for you in Av, Tv, P and M modes ? Wow.
I think for me this would make the camera basically unusable, or I'd have to relearn a whole different style of shooting.
Really no ability to do one shot focusing in any of those modes ? |
I compose the shot and change my autofocus point to suit the scene. Most times I can get it very close to the thing I want most in focus.
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04/23/2004 12:34:41 PM · #16 |
The only solutions I have are to
1. move very slowly so the Ai-Servo doesn̢۪t kick in (works most of the time)
2. Switch the lens to MF and focus manually
3. Once focus is achieved press the AF stop button on the lens then recompose and shoot (only good if you have a lens with the AF stop button)
4. Pick one of the AF points that is appropriately located (if one exists).
It is limiting but far from making the camera unusable. I focus and recompose constantly with my DR without too much trouble.
Greg
Originally posted by Gordon:
Originally posted by dadas115:
In the normal shooting modes, P, Av, Tv, M... you are stuck with Ai-focus mode as others have mentioned. I find this very limiting as the camera rarely ever knows when it is appropriate to use Ai-Servo or Single Focus mode. The thing I have been resorting to is using the camera in sports mode. In sports mode the camera only uses Ai-Servo mode but you can't control exposure compensation, ISO or image quality manually with sports mode. It isn't ideal but it is better than nothing.
Greg |
So if you try to focus and recompose the camera is going to keep refocusing for you in Av, Tv, P and M modes ? Wow.
I think for me this would make the camera basically unusable, or I'd have to relearn a whole different style of shooting.
Really no ability to do one shot focusing in any of those modes ? |
Message edited by author 2004-04-23 12:38:39. |
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04/23/2004 12:36:48 PM · #17 |
They are Ai-Focus NOT Ai-Servo so it isn't quite as bad as you thought.
Greg
Originally posted by Gordon:
Originally posted by Konador:
I just switch to MF on the lens after the camera achieves its focus, which stops it changing the focus. |
I'm pretty surprised. I had been considering a 300D, but if all the modes where you can control exposure are all AI-servo that's pretty bad. |
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04/23/2004 01:36:19 PM · #18 |
Originally posted by dadas115:
They are Ai-Focus NOT Ai-Servo so it isn't quite as bad as you thought.
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Okay - thanks.
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04/23/2004 01:47:32 PM · #19 |
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04/23/2004 02:18:33 PM · #20 |
Ai-servo is Canon speak for continuous autofocus.
Greg |
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04/23/2004 02:40:01 PM · #21 |
that's what I thought. thanks!
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04/23/2004 03:20:56 PM · #22 |
Originally posted by Gordon:
I'm pretty surprised. I had been considering a 300D, but if all the modes where you can control exposure are all AI-servo that's pretty bad. |
For me this is the single biggest pain in the rear on the 300D. It forces me to use full-time manual focus on many occasions. I am hoping someone will come up with a usable patch -- official or not -- to the micro code to remove AI servo.
Message edited by author 2004-04-23 15:23:16. |
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04/23/2004 03:32:20 PM · #23 |
i dont have the manual with me - but i think what is being spoken of here only works in sports mode. focus tracking on a moving subject.
i tried it on a windy day with some birds. and got decent results.
its the 1st time i have used the camera on anything but full manual - so i could be wrong. but i find the auto modes annoying. i also - in most cases find the auto focus annoying.
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04/23/2004 06:05:19 PM · #24 |
If you hold the shutter release half way down while manually focusing, the focus assist will blink when proper focus has been achieved. Then you can recompose without fear of focus changing.
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04/23/2004 06:34:55 PM · #25 |
if you look on page 123 of the english manual - it tells you what the different focus modes do, and what camera modes they apply too.
as i mentioned above, AI servo is only available in sports mode.
AI focus is being used in most creative modes, but not in sports mode.
point selection auto focus is used on most of the creative modes.
Originally posted by :
Can anyone explane to me how I do it in the Rebel.
Can´t find it in the manual. |
Message edited by author 2004-04-23 18:36:27. |
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