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stupid ???
Maybe this might sound dumb but heres a question. what AF setting would I set a nikon on to keep mroe than one thing in focus, say two people that are at apprix the same distance but not exactly the same distance. for some reason I often take pictures of my children, zoomed in but if one is say 8 inches in front of the other the one behind may be slightly OOF. thanks in advance for the help..

Comments (16)

Focuses on a specific point. If you use a matrix focusing system it will pick sort of an average point from however many points your camera uses. With that, some may still be out of focus..

Your best option is to shoot with a smaller aperture for a greater DOF.Patrick T. KellyOaxaca, Mexico..

Comment #1

Your problem is not a matter of focus, but a matter of depth of field. Focus on the closer child, and use a larger aperture number to get more depth or distance into the frame that appears in focus..

'I reject your reality and substitute my own' -Adam Savagehttp://www.flickr.com/photos/mrnoronha/sets/..

Comment #2

You're referring to control of the depth of field (DOF)..

Http://www.dpreview.com/learn/?/Glossary/Optical/Depth_of_Field_01.htm.

Http://www.luminous-landscape.com/...tutorials/understanding-series/dof.shtml...Bob, NYC.

Galleries: http://www.pbase.com/btullis.

Image control:Zoom outZoom 100%Zoom inExpand AllOpen in new window..

Comment #3

Depends on the focal length and distance and aperture. If you were using 200mm focused at 8 feet away with a f/2 aperture you'll never get two subjects at different distances in focus without stopping down to f/32 or something..

Sometimes it's hard to get a persons nose and eyes focused..

Normally when I want two subjects in focus at two different distances I'll make sure I'm using an aperture that will get both focused when I manually focus halfway between both. Depth of Field preview button is very useful for that situation...

Comment #4

Haha, my Canon XSi has that button, but I never use it... The image in view finder dims when I use that button.....

Comment #5

Adding together various answers....

No, not stupid. You just have not learned this yet..

Yes, the concept at play is depth of field..

The smaller the aperture, the greater the depth of field. But to confuse people, as apertures get smaller, the number gets hirer. So if f4 means one "soft" person, f8 is smaller, and has greater depth of field, and a better chance of getting both people sharp..

As suggested, fucussing between them works wek, buyt to do this, you may have to switch to manual focua, if your camera allows..

To get a smaller aperture, you'll need a slower shutter speed, or a higher ISO setting...

Comment #6

Use is narrow aperture (high number)..

If you struggle to get a high number and keep the shutter speed up put the ISO up to say 400..

It is difficult to give a more precise answer as you do not say what camera..

P.S. I tried to find out what camera by viewing your online photos. I cannot get into them, They all require a password so there is not much point is listing them in your posts unless you change that..

Chris Elliott.

*Nikon* D Eighty + Fifty - Other equipment in Profile.

Http://PlacidoD.Zenfolio.com/..

Comment #7

4honor wrote:.

Haha, my Canon XSi has that button, but I never use it... The imagein view finder dims when I use that button....

Seriously, this realization of yours isn't funny. The viewfinder dims because when closing down the aperture during DOF preview, you see an approximation of the effect of reduced light hitting the sensor...

Comment #8

Iggier wrote:.

4honor wrote:.

Haha, my Canon XSi has that button, but I never use it... The imagein view finder dims when I use that button....

Seriously, this realization of yours isn't funny. The viewfinder dimsbecause when closing down the aperture during DOF preview, you see anapproximation of the effect of reduced light hitting the sensor..

It isn't an approximation. It is exactly the reduction in light caused by the closing of the aperture from wide open (the camera keeps it wide open for focusing and metering) to the selected aperture. The same change will occur just before the shutter opens to expose the sensor.Chefziggyhttp://www.pbase.com/chefziggy/lecream..

Comment #9

Do the nikons have an A-Dep function, which automatically calculates the DOF??..

Comment #10

Well, at least the D70 nor D300 has it. That I'm aware of.Chefziggyhttp://www.pbase.com/chefziggy/lecream..

Comment #11

Richardwigley wrote:.

Do the nikons have an A-Dep function, which automatically calculatesthe DOF??.

No. And I do not understand why all DSLRs do not have it. There is enough brain power on them to compute it and all the information is there on most cams. In particular a Nikon with a D lens knows the focus distance..

Which make of cams do have it?.

Chris Elliott.

*Nikon* D Eighty + Fifty - Other equipment in Profile.

Http://PlacidoD.Zenfolio.com/..

Comment #12

Ive got a canon 40D and that has it so I presume it's on all canons!! Although it does have it's uses, sometimes it does end up calculating an unusably long shutter speed to compensate for a large F stop!!.

Chris Elliott wrote:.

Richardwigley wrote:.

Do the nikons have an A-Dep function, which automatically calculatesthe DOF??.

No. And I do not understand why all DSLRs do not have it. There isenough brain power on them to compute it and all the information isthere on most cams. In particular a Nikon with a D lens knows thefocus distance..

Which make of cams do have it?.

Chris Elliott.

*Nikon* D Eighty + Fifty - Other equipment in Profile.

Http://PlacidoD.Zenfolio.com/..

Comment #13

Someone a few months ago had this same question. Perhaps this post might help.....

Http://forums.dpreview.com/...ms/readflat.asp?forum=1034&message=26353352..

Comment #14

Chris I have the d80 and d300 (ill be using d300 this day). btw where did I ilist my galleries?.

Image control:Zoom outZoom 100%Zoom inExpand AllOpen in new window..

Comment #15

Mrfizzed wrote:.

Chris I have the d80 and d300 (ill be using d300 this day). btwwhere did I ilist my galleries?.

In your profile (I thought it might tell me which cameras you had)..

Right:.

D80 - use apertures up to f/13 (f/16 max)D300 use aperrures up to f/11 (f/13 max).

Above those figures you will get diffraction which will soften the image and fight against the extra depth of field and few lenses are at their sharpest above f/11 anyway. Sticking with f/8 as a starting point is a sound proposition..

Chris Elliott.

*Nikon* D Eighty + Fifty - Other equipment in Profile.

Http://PlacidoD.Zenfolio.com/..

Comment #16

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This question was taken from a support group/message board and re-posted here so others can learn from it.

 

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