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chrispy

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Jan 17, 2009
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someone once told me the smaller ur aperture the sharper ur pic will be. i duno whether is it true...

Ex. f22 compare to f8 wich 1 really give a very sharp pic at nite? can some1 pls explain to me? thks in advance!!!!
 

Octarine

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Jan 3, 2008
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Pasir Ris
#2
someone once told me the smaller ur aperture the sharper ur pic will be. i duno whether is it true...
Ex. f22 compare to f8 wich 1 really give a very sharp pic at nite? can some1 pls explain to me? thks in advance!!!!
Your pictures are only sharp when the focus is correct. But the questions is: what is your focus? The entire landscape or a single person? The key word here is Depth of Field (DOF). Aperture alone doesn't make your picture sharp, it determines how much of the picture is also sharp, apart from the object in focus.
Read about DOF: http://www.cambridgeincolour.com/tutorials/depth-of-field.htm
Also keep an eye on diffraction: http://www.cambridgeincolour.com/tutorials/diffraction-photography.htm
 

chrispy

New Member
Jan 17, 2009
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#3
Your pictures are only sharp when the focus is correct. But the questions is: what is your focus? The entire landscape or a single person? The key word here is Depth of Field (DOF). Aperture alone doesn't make your picture sharp, it determines how much of the picture is also sharp, apart from the object in focus.
Read about DOF: http://www.cambridgeincolour.com/tutorials/depth-of-field.htm
Also keep an eye on diffraction: http://www.cambridgeincolour.com/tutorials/diffraction-photography.htm
i am taking landscape pic... think my focus point too far and i uses smallest like f22 aperture tat's y my f8 aperture pic is sharper. thks for clearing my doubt bro!!! will read thru the link to understand better thks alotz...
 

Rashkae

Senior Member
Nov 28, 2005
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#4
i am taking landscape pic... think my focus point too far and i uses smallest like f22 aperture tat's y my f8 aperture pic is sharper. thks for clearing my doubt bro!!! will read thru the link to understand better thks alotz...
f22 is already bad. You suffer from diffraction. f/8 to f/16 is good.
 

Octarine

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Jan 3, 2008
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Pasir Ris
#5
i am taking landscape pic... think my focus point too far and i uses smallest like f22 aperture tat's y my f8 aperture pic is sharper.
See Rashkae's comment. I guess your picture suffers from diffraction already.
But to be clear about that: please check your pictures whether all parts appear to be softer at f/22 or only certain parts. If all parts are softer than it's diffraction or handshake (very small aperture will also cause long exposure times, that calls for handshake blurring). Open the aperture to f/8 or f/11. Check that shutter speed follows the rule of 1/focal length (e.g. 1/20s or faster for focal length of 20mm[* crop factor]).
If only a part of the picture appears soft then focusing was wrong. Check whether you use one predefined focus point or whether the camera determines. It's better to use one defined focus point to make sure the focus is where to want it to be. Focusing works best with horizontal or vertical lines being close to the focusing point.
 

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