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What f/stop will make my pictures sharp?

post #1 of 25
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Right now I have a Nikkon DX 18mm-55mm f/3.5-5.6. I read up you calculate something to figure out what the best aperture makes the sharpest image.
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post #2 of 25
Depends on the body its mounted on and ISO setting
    
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post #3 of 25
Thread Starter 
Quote:
Originally Posted by drb328 View Post
Depends on the body its mounted on and ISO setting
D5000, Low to High (100-6400)
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post #4 of 25
Aperture has more to do with exposure and depth of field rather than sharp pictures. But the lower the aperture the more light gets let in. This means you can raise your shutter speed which can help with sharper pictures especially if your shooting off tripod.
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post #5 of 25
Thread Starter 
Quote:
Originally Posted by Racersnare21 View Post
Aperture has more to do with exposure and depth of field rather than sharp pictures. But the lower the aperture the more light gets let in. This means you can lower your shutter speed which can help with sharper pictures especially if your shooting off tripod.
No I understand that but I also heard by google. Each lens has a prime aperture for the sharpest image. Like this Nikon 50mm 1.8, produces the sharpest image (which focusing on a low F/stop) is 2.8. Anything over looks unsharp and anything under also looks unsharp.

I'm unsure if you can calculate it
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post #6 of 25
99% of the time, its f/8.
post #7 of 25
Thread Starter 
Quote:
Originally Posted by dudemanppl View Post
99% of the time, its f/8.
Do you know how I can find out for sure? People say f/8-f/11 depending how far you zoomed in.
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post #8 of 25
A wider aperture (lower f/stop number) will allow more light in, which will lower your shutter speed and can make a sharper exposure of the focused object but objects nearer or farther by even a little bit will be blurry. A narrower aperture (higher f/stop number) will require a slower shutter speed which can blur the image if the subject is moving or if you are not using a tripod, but it gives a deeper field that will be in focus (i.e. objects can be closer or farther from the focal point by a greater margin and still appear sharp).
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post #9 of 25
depends on the lens/aperture. For my 17-40mm F/4L it's around F/9.

There's diminishing returns when it comes to using super high F stops.
 
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post #10 of 25
Quote:
Originally Posted by Unknownm View Post
Right now I have a Nikkon DX 18mm-55mm f/3.5-5.6. I read up you calculate something to figure out what the best aperture makes the sharpest image.
Awesome site I just found: http://www.slrgear.com/reviews/showp...uct/130/cat/13

At 18mm it looks like F/5.6 and F/8 have least blur units.
At 35mm F/8 - F/11
At 55mm F/11
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