f/2.8 vs ISO
Feb 21, 2012 14:07:35 #
If I am shooting indoors in Manual f/2.8 ISO 1600 and some of my pictures are blurry should I increase the f and ISO to see if there is a difference?
Thank You
Thank You
Feb 21, 2012 14:17:19 #
Feb 21, 2012 14:22:38 #
Stopping down the aperture to f/5.6 will only make it worse, as the shutter will slow down even more to let the same amount of light in. Whether caused by camera shake or subject movement, the only way to overcome the blurries is to speed up the shutter, or if it's camera shake, get a steadier platform. Since we're at f/2.8 already, we can't open her up any more, so bumping the ISO might be enough. We don't know what the OP used as as shutter speed. They always say that anything slower than 1/60th or so will show camera shake.
Feb 21, 2012 14:24:33 #
Roger Hicks
Loc: Aquitaine
INCREASE to f/5.6?
I'm misunderstanding something. Going from f/2.8 to f/5.6 is decreasing the aperture (= smaller hole).
What's causing the blur? Camera shake, or lack of depth of field?
Cheers,
R.
I'm misunderstanding something. Going from f/2.8 to f/5.6 is decreasing the aperture (= smaller hole).
What's causing the blur? Camera shake, or lack of depth of field?
Cheers,
R.
Feb 21, 2012 14:28:35 #
Feb 21, 2012 14:35:42 #
I was going to ask what your shutter speed was, but you just posted that it is at 1/400.
without seeing the pictures in question, I would guess your DOF might be to shallow, try decreasing it (as mentioned earlier) to see what the results look like.
without seeing the pictures in question, I would guess your DOF might be to shallow, try decreasing it (as mentioned earlier) to see what the results look like.
Feb 21, 2012 14:36:11 #
Roger Hicks wrote:
My question, as well. INCREASE to f/5.6?
I'm misunderstanding something. Going from f/2.8 to f/5.6 is decreasing the aperture (= smaller hole).
What's causing the blur? Camera shake, or lack of depth of field?
I'm misunderstanding something. Going from f/2.8 to f/5.6 is decreasing the aperture (= smaller hole).
What's causing the blur? Camera shake, or lack of depth of field?
OP claims shutter duration of 1/400-sec at f/2.8, with ISO 1600.
Increasing ISO, and decreasing aperture should increase DOF and maintain 1/400-sec shutter duration.
At ISO 3200 (+ 1-stop) & 1/400-sec should decrease aperture to f/4 (- 1-stop).
Feb 21, 2012 14:36:40 #
What are you shooting? 1/400th at 2.8 should give you good results for most stuff, unless you're not getting a good focus point. Could be, as Roger noted, not enough DOF. If you stop down to f/3.5 or f/4.0 that may help, but you'll need to check and make sure you're still getting enough light. Doing this will cause a corresponding decrease in shutter speed, maybe down to 1/200th or slower. There's a chart someplace that shows how aperture changes affect shutter speed, so I'm probably wrong about the speed.
Feb 21, 2012 14:46:08 #
k9moe wrote:
If I am shooting indoors in Manual f/2.8 ISO 1600 and some of my pictures are blurry should I increase the f and ISO to see if there is a difference?
Thank You
Thank You
With the settings you have posted, some are clear by inference. Would you be willing to post a sample of each for evaluation? We will kind and gentle!
Feb 21, 2012 14:54:48 #
Don't tell anyone bu I am at work. When I get home I will post some examples. But having said that how do I increase Depth of Field? Sorry am am a newbie.
Feb 21, 2012 14:56:46 #
Feb 21, 2012 14:56:55 #
k9moe wrote:
From post above:Don't tell anyone bu I am at work. When I get home I will post some examples. But having said that how do I increase Depth of Field? Sorry am am a newbie.
OP claims shutter duration of 1/400-sec at f/2.8, with ISO 1600.
Increasing ISO, and decreasing aperture should increase DOF and maintain 1/400-sec shutter duration.
At ISO 3200 (+ 1-stop) & 1/400-sec should decrease aperture to f/4 (- 1-stop). This will slightly increase your DOF.
At ISO 3200 (+ 1-stop) & 1/200-sec (+ 1-stop) should decrease aperture to f/5.6 (- 2-stops). This will double your DOF.
Feb 21, 2012 15:01:11 #
Depth of field is a function of lens focal length, distance to subject, and aperture size.
use the online depth of field calculator to see what change will make the difference in depth of field you need.
use the online depth of field calculator to see what change will make the difference in depth of field you need.
Feb 22, 2012 05:57:36 #
Feb 22, 2012 07:38:38 #
What was the subject matter, any motion? what lens were you using as a long lens has a shallower depth of field. If this is the case you can use a shorter focal length lens and move in closer to the subject. Also if the subject is moving, even at a 400th you may get some motion blur.
As you can see many things can cause a blurry image. Go down the list of suggestions eliminating one at a time until you find the culprit.
As you can see many things can cause a blurry image. Go down the list of suggestions eliminating one at a time until you find the culprit.
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