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10/06/2003 08:12:31 AM · #1 |
I am really getting close to purchasing a 300D myself, however I am tossing and turning (procrastinating and killing myself) about the decision while I isolate what I really do and do not need in a camera. If I do get the 300D that will be it, I will be committed to canon lenses and even the 300D body for quite a while.
Ok can someone please explain a few points about the 300D to me, and forgive me if I sound dumb but I really do need to get these question squared away in my mind.
Focus questions
1 AI focus. Does this mean that once the shutter button is half pressed the lens locks onto what ever you are pointing at and then refocus if you move the lens to another object?
2. One shot AF. Half press the shutter button and the lens focuses and stays at that focus no mater where you point the lens after that?
3. AI servo AF. The lens is always focusing even when the shutter button is not pressed?
Metering questions
When talking about metering, whatâs the difference between partial 9% at center and center-weighted average? Is one of these terms a term that Canon uses for what I call spot metering? Or are they different things altogether and so this camera does not have spot metering?
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10/06/2003 08:17:20 AM · #2 |
A spot meter is typically about a 1% section from the center of the view. The partial meter, is like that but a slightly larger sample 'spot' at 9%.
Center weighted average, averages over the entire scene, but gives more bias to the center.
You would see a difference between the results of this if for example you pointed the camera at a white ball on a black background - the center average would tend to expose more towards the black background than the partial meter, which would only consider the white ball.
AI focus and AI Servo seem to be pretty much the same thing - the camera is constantly focusing, so if you are following someone running towards you the camera will move focus to track it. There is also some level of prediction in there where it tries to anticipate what direction to adjust the focus.
One Shot focus means that the camera will focus until it gets a lock, and then not focus again until you release and half depress the shutter. |
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10/06/2003 08:57:18 AM · #3 |
Craigant, have you read this review? I thought it did a fair job of explaining the various focusing options available on the Digital Rebel.
Imaging Resource review of Digital Rebel
Although not in the same league as your proposed move from 602z to the 300D, I experienced a somewhat similiar transition when I went from my Fuji 3800 to my current Pro 90, which has (what Canon called at the time) CAF, or Continuous Auto Focus. Now, I don't think I would buy a camera that does not have this feature, or something similiar. |
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10/06/2003 09:05:30 AM · #4 |
Thanks for that Gordon.
From the sounds of it the metering system does not sound like it would be too restrictive compared to say the D60. What are your views on that? Iâm not sure what the D60 has in the way of metering but would you find it a pain only having what the 300D has?
Iâm not sure that the AI focus being basically fulltime is a good thing, I understand that the one shot focus can only be used on the âseen modesâ which Iâve never use in any of my cameras.
It would be almost impossible to have an off center subject in focus with the AF system this camera has unless you used manual focus wouldnât it?
Any comments about this from 300D users would be welcomed. I may just need educating.
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10/06/2003 09:18:04 AM · #5 |
The metering is essentially the same in the 300D as in the D60. The difference is that you have less control over what metering patterns are used in particular modes. With the D60, the metering mode is independent of the other camera modes, as is the autofocus selection. With the 300D the same AF and metering modes are available, you just can't always select them.
Autofocus has 2 components - the focus mode, one shot, full time tracking etc, and also where the focus point is. The 300D has 7 points I believe, which are selectable, so you can have an off center subject even with full time focusing.
I almost exclusively use one-shot focus or manual focus so I don't know much else about the AI or auto modes. |
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