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a lot of new model cameras lately have been sporting a high number of AF points 7D, 50D, 1 series all have a lot of points.....
I personally use ony the Center AF point..... am I losing some of the beneifts that the other AF points offer???
Also, it is said that the 7D or 1 series will focus fatser [assuming all use 2.8 lens or higher]...... using the the 7D or 1 series and having only CENTER AF active... will they focus slower????
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Originally Posted by jks_photo
When I had my 40D I just used the center mainly. The 7D gives me a better chance of gettingan eye locked in one of the little squares without recomposing.
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Originally Posted by jks_photo
If I get what your asking, the answer is no. The center AF point is the only one that is 2.8 (which is good) with the rest being 5.6 I think.The camera as a whole is better at focusing. Didn't I read that you shot Nikon before? The digital versions of Nikonhave a crazy amount of focus points. Too many if you ask me. Rather than actually using all of them individually and scrolling across to get to the right one, you'dprollyclump them together in groups so I don't think you actually gained anything.
Take everything I say lightly. I'm stil pretty new.
Greg
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Originally Posted by jks_photo
The 7D will focus faster. For my shooting I keep my 5D and 7D on center point single shot only. And then change it if I want to do something else with it.
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Originally Posted by jks_photo
The other thingwhen talking aboutfocusing speeds, and I believe I'm correct in saying this, is Single Shot Mode happens to be slower but more accurate, and the Servo Modesare faster but maybe a little less accurate due to what your asking it to do. But getting back to your 7D and1 series, their fancy math stuff (algorithms and other words I can't spell)they use in finding focusis better than some of the other cameras on the lower end.
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Originally Posted by jks_photo
IMHO, Yes.
When I am out shooting Birds, and especially Birds In Flight I will leave it on the center focus point using Spot metering mode just because it is faster and more convenient for that particular situation. Otherwise what focus point I use depends on the effect I want to capture within the complete picture/scene. When choosing a focus point you also have to consider the metering mode and f/stop as well.
Composition (Framing) How do you want to frame the picture and what part do you want in focus, to draw attention to? You don't always want the center only in focus. E.g. Rule of thirds!
http://www.digital-photography-school.com/digital-photography-composition-tips
http://www.cambridgeincolour.com/tutorials/camera-autofocus.htm
IMO center is the best for single shots. The only time I have ever used automatic (utilising all focus points) is when I am trying to catch moving subjects and have it on Servo. The 7D has quite a few different AF options but i only use the center. 7D has always been notable for better action photography with the super-fast burst and i guess AF options.
Good question as I have always wondered the same thing.
Typically the centre focus point is the most sensitive as it is a *cross-type* sensor and as such focusing will be much quicker than let
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Originally Posted by elmo_2006
It is more accurate, but really is it faster? I thought AF speed waslimited by the lens's AF motor? I'm not sure, but it seems logical to me. I don't think anylens will focus faster on a 7D then on a 5D2, but I might be wrong [A]
Hi Jan and thanks for chiming in.
You are correct, I should have listed *more precise* than faster. My apologies.
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Originally Posted by Jan Paalman
When I bought my 7D to use with my 500m F4 L, instead of my 5D Mark II, it seemed that the 7D was slower. So I tested this, on singe point single shot focus the 7D was indeed slower than the 5D Mark II by 1 tenth to 2 tenth of a second.
By not utilising your outer focus points there is a chance you
thanks guys.... thats what I usually focus then recompose the shot
Just to be clear, if you're using a longer, fast lens wide open with a relatively close subject (where DoF is very thin), focus-recompose is not a good idea - you'll usually miss focus on your subject.
ok neuro.... thanks for that clarification....
John that may have been your shortest post.... ever. [:D]
Thanks for clarifying though - I was 14 hours into a 16 hour night shift so things don't always come out the way they're supposed after that.