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How to stop blur at the extremes of an image?

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How to stop blur at the extremes of an image?

Postby shazzm on Sat Nov 29, 2008 8:46 pm

I have a picture of my dad (which is very unusual as he is cameraphobic lol), but i seem to only focus in the centre of the picture.... any suggestions on keeping the whole image in focus? Thanks

nikonD60 f/5.6 1/125 sec. ISO 400 55-200 lens

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http://www.flickr.com/photos/sharynmayne/3067114853/
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Re: How to stop blur at the extremes of an image?

Postby chrisk on Sat Nov 29, 2008 9:24 pm

stop the aperture down some more. try f11 next time. the smaller the aperture the greater the DOF.
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Re: How to stop blur at the extremes of an image?

Postby aim54x on Sat Nov 29, 2008 9:29 pm

Rooz wrote:stop the aperture down some more. try f11 next time. the smaller the aperture the greater the DOF.


Beaten to it, Rooz it right on. You have used the lens wide open and focused very close (for this lens anyway) hence your depth of field is fairly small. Stopping it down will help to grab you some more DOF.
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Re: How to stop blur at the extremes of an image?

Postby blacknstormy on Sat Nov 29, 2008 10:11 pm

flikr is doing bad things - have no photo :(
Dodging and burning are steps to take care of mistakes God made in establishing tonal relationships! -Ansel Adams

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Re: How to stop blur at the extremes of an image?

Postby [kane] on Sat Nov 29, 2008 10:32 pm

Same as above, but I'd add one thing, use f22 and a tripod, as the lower (higher number) the f stop the less light, so at this close crop you might get some blur.

Good luck, great shot btw, very sharp.
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Re: How to stop blur at the extremes of an image?

Postby DaveB on Sat Nov 29, 2008 10:54 pm

Just in case it's not clear, the problem here isn't that the areas towards the edge of the frame are out of focus, but just that the in-focus area is a fixed distance from the camera. The smaller the aperture (the larger the value) the greater the depth of in-focus areas in front of and behind that distance...
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Re: How to stop blur at the extremes of an image?

Postby shazzm on Sun Nov 30, 2008 12:04 am

oh yeah, I see what u mean... i just took a shot at f5.6 then one at f32 and it makes a big difference. Thanks guys, that was helpful. With help like that I won't be a newbie for long lol
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Re: How to stop blur at the extremes of an image?

Postby aim54x on Sun Nov 30, 2008 12:19 am

shazzm wrote:oh yeah, I see what u mean... i just took a shot at f5.6 then one at f32 and it makes a big difference. Thanks guys, that was helpful. With help like that I won't be a newbie for long lol


Glad to hear that we have helped someone, keep the questions coming, so we can all learn!!!
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Re: How to stop blur at the extremes of an image?

Postby Matt. K on Sun Nov 30, 2008 5:11 pm

Just one other point....you have focused on the end of his nose....there is nothing in front of his nose but there is some lens sharpnes (depth of field) not being used in front of his nose. If you had focused on his eyes then the tip of his nose would still have been reasonably sharp and the edges of the frame would have been sharper because the available DOF would have been moved backwards. I hope this makes sense to you.
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