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Photography Question 
james w. bonham II
 

wider focus area


hello,
my question is:how do I expand the area of focus, whether is use wide angle or tele,i get a smallarea of focus, I would like to have more than one subject in my snaps in focus, how is this done?
jim


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9/10/2007 9:22:34 PM

 
Jon Close
BetterPhoto Member Since: 5/18/2000
  What camera?
More generally, there can only be a single distance that is in critical focus. Objects nearer and farther will be gradually less focused. If you are able to control the lens aperture, then narrower apertures (higher f-numbers) will give greater depth of focus - the range in front and behind the focus point that is still in acceptibly sharp focus. Also, shorter focal lengths and longer camera to subject distance increases depth of field.


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9/11/2007 6:43:42 AM

 
John P. Sandstedt
BetterPhoto Member Since: 8/8/2001
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  Jon is correct.

But, with my Canon 30D, I have the ability to have as many as 9 separate points of focus. Hence, his question to you is very important.


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9/11/2007 7:25:20 AM

 
james w. bonham II   thanks for responding,
i probably could have formed my question a little better, im not concerned w/ DOF,
I would like to have a wider focus area,
i have a tele that gives me all the depth I need, but I like to take family shots, people next to each other.
thanks,
jim
canon 1d MRK III


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9/11/2007 11:35:39 AM

 
Jon Close
BetterPhoto Member Since: 5/18/2000
  For the 1D III, the widest AF area is using Auto AF Point Selection (p. 84). The camera analyzes the input from all 45 AF sensors to chose the active sensor(s) and to set focus.

If you are manually selecting a single AF point from the 19 cross sensors, then setting C.Fn III-8 to either 2 or 1 will enable the "hidden" AF sensor(s) around the selected point to widen the AF area. (p. 170).


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9/11/2007 12:34:24 PM

 
james w. bonham II   Thats what I was looking for, this is a great camera but it's only going to be as good as the operator,i had selected "inner 9 points" c.Fn:III 9(1)
i was missing the af expansion,
thanks Jon,

cheers,
jim


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9/11/2007 2:57:08 PM

 
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