Question about AF Points how to take grp pic clearly


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malofsg

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Jul 20, 2008
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#1
Hello, I am currently using the Canon 450d and i have a question about the AF points. I want to know how am i able to take everything clearly without the AF point forcusing on few or one subjects for example if i were to take a group pic i want the cemera to be able to take everyone clearly just like how a point and shoot cemera with out forcusing on few sub and the rest blur?
 

desibelle

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Mar 29, 2008
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#4
I normally set the AF point to the middle one. To take group shots, like what geraldkhoo says, just increase f-number. Use flash if in low light conditions.
 

May 11, 2008
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#5
I normally set the AF point to the middle one. To take group shots, like what geraldkhoo says, just increase f-number. Use flash if in low light conditions.
i too have a noob question. I also normally set AF to the middle one and play with DOF via aperture. In that case, how does those multi-point AF take an advantage? the masses always preach the more the merrier. so how will more AF points be more advantageous?
 

geraldkhoo

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Jun 15, 2007
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#6
i too have a noob question. I also normally set AF to the middle one and play with DOF via aperture. In that case, how does those multi-point AF take an advantage? the masses always preach the more the merrier. so how will more AF points be more advantageous?
Most of the time, I shoot using only 1 AF point, the middle one... where I focus, then shift for framing, and then shoot.

However, the multi-AF points are useful when you want to shoot moving objects. You can change to continuous focus tracking mode with multiple AF, and the camera can track the moving object, and you fully press the shutter release to capture the image. Hence, depending on how many AF points you have, it would determine how well the tracking goes... and that is why the new Nikons (D300, D700, D3) have 51 AF points.
 

Feb 11, 2008
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#7
Most of the time, I shoot using only 1 AF point, the middle one... where I focus, then shift for framing, and then shoot.

However, the multi-AF points are useful when you want to shoot moving objects. You can change to continuous focus tracking mode with multiple AF, and the camera can track the moving object, and you fully press the shutter release to capture the image. Hence, depending on how many AF points you have, it would determine how well the tracking goes... and that is why the new Nikons (D300, D700, D3) have 51 AF points.
Er, how do u stick to 1AF point permanently?
 

May 11, 2008
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#8
Most of the time, I shoot using only 1 AF point, the middle one... where I focus, then shift for framing, and then shoot.

However, the multi-AF points are useful when you want to shoot moving objects. You can change to continuous focus tracking mode with multiple AF, and the camera can track the moving object, and you fully press the shutter release to capture the image. Hence, depending on how many AF points you have, it would determine how well the tracking goes... and that is why the new Nikons (D300, D700, D3) have 51 AF points.
thanks mate. 51 AF points, jesus, the whole viewfinder must be filled with dots.
 

calebk

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Jul 25, 2006
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Clementi
#10
i too have a noob question. I also normally set AF to the middle one and play with DOF via aperture. In that case, how does those multi-point AF take an advantage? the masses always preach the more the merrier. so how will more AF points be more advantageous?
You already got one part right in knowing that the masses preach that more = merrier, which is not always true.

You need multiple AF points when you are shooting things that don't give you the luxury of time to focus with the middle point then recompose.

Er, how do u stick to 1AF point permanently?
Please, I beg you, start with the manual. Hint: look for the button called "AF point select" or something to that extent.
 

catchlights

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Sep 27, 2004
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#11
in the good old days where all lenses come with "Depth of Field" scale, all we need to do is very simple...

focus on the first row pple faces, remember the distance marking,

and focus on the last row pple faces, remember the distance marking too,

turn the focusing ring to the mid point of the two distance marking,

finally, see which f-stop have the "Depth of Field" scale able to cover two distances and use that f-stop, you will have enough DOF to cover the front and rear row now.
 

Feb 11, 2008
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#13
Please, I beg you, start with the manual. Hint: look for the button called "AF point select" or something to that extent.
Now that you say it, i remembered it correctly. Previously i thought the AF select pt(yes, i know it) only worked for the current shot :think:
 

acitinium

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Aug 3, 2008
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#14
Hello, I am currently using the Canon 450d and i have a question about the AF points. I want to know how am i able to take everything clearly without the AF point forcusing on few or one subjects for example if i were to take a group pic i want the cemera to be able to take everyone clearly just like how a point and shoot cemera with out forcusing on few sub and the rest blur?
There is a Auto depth-of-field (a-dep) on the dial above M

Extract from manual about this mode
""
Objects in the foreground and background will be in focus automatically.
All the AF points will function to detect the subject, and the aperture
required to attain the neccessary depth of field will be set automatically.
*<A-DEP> stands for Auto-Depth of field. This mode sets the depth of field automatically.
""
 

calebk

Senior Member
Jul 25, 2006
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Clementi
#15
There is a Auto depth-of-field (a-dep) on the dial above M

Extract from manual about this mode
""
Objects in the foreground and background will be in focus automatically.
All the AF points will function to detect the subject, and the aperture
required to attain the neccessary depth of field will be set automatically.
*<A-DEP> stands for Auto-Depth of field. This mode sets the depth of field automatically.
""
Hmm. That said, I don't quite trust it, and would rather just rely on plain old f/8 and be there.
 

calebk

Senior Member
Jul 25, 2006
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Clementi
#17
i suggested using that because he mentioned point and shoot
A-DEP &#8800; point-&-shoot operability. You still have to tell the camera the nearest point, then the furthest point, and the camera will calculate it. That done, it is not always full-proof.

f/8, and a short focal length, in comparison, gives more than sufficient DOF almost all the time for group photos.
 

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