Tiny Aperture + Fast Shutterspeed and Low ISO = Noisy image?

Panzerbjorn

Panzerbjorn

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Lo all,

I'm processing some images from the beach that I took on Christmas day (Yes it takes me a long time to get organised) :p

It was a very bright day and some of the images were shooting straight into the sun so I was running at f/22 and using ~1/1200 shutter speeds at ISO200 on my Nikon D50.

Many of the images (even those not pointing at the sun) have come out correctly exposed but quite noisy.

Does this sound right? Have I made a fatal mistake by shooting at f/22?

Cheers for any insights.

Panzer
 
Are you sure the exposure is right? An over exposed image could give you odd noise etc too, but normally the highlights just blow out.

Any chance of a sample pic to see?
 
this shouldn't lead to noise, could you post an example so we can see the problem?
 
It doesn't really matter what the aperture is as long as you set the corresponding shutter speed to maintain correct exposure.

f22 can cause diffraction problems, due to the light being squeezed through that tiny aperture opening. Too much of it gets deflected off the diaphragm blades at an angle and then gets gets bounced around off the internal glass causing loss of definition. F8 or f11 is generally considered to give optimum performance but it varies from lens to lens.

It shouldn't produce noise issues though which is usually caused by high ISO or underexposure.
 
Are you processing the images in Adobe Camera Raw and if so is it set to auto adjust by default?

This problem has come up a few times before where the shots looks correctly exposed but it was because ACR had ramped up the exposure to compensate and added a lot of noise as a result...
 
Thanks for all the fast replies guys. :)

I feel very, very stupid but having just checked the EXIF on the sample photo I was about to upload, it seems my whole shoot was taken at ISO800. :$

That would explain it really. Oh dear.

Panzer
 
i do that all the time its soooo annoying!:bonk: If its not the iso its blummin white balance. one of these days....
 
Panzerbjorn said:
Thanks for all the fast replies guys. :)

I feel very, very stupid but having just checked the EXIF on the sample photo I was about to upload, it seems my whole shoot was taken at ISO800. :$

That would explain it really. Oh dear.

Panzer
Click to expand...

Pah! Convert them all to b&w, chuck in a little extra grain and bob's your uncle. Great beach shots ooooozing with a natural and elemental atmosphere. ;);):thumbs:
 
f.box said:
i do that all the time its soooo annoying!:bonk: If its not the iso its blummin white balance. one of these days....
Click to expand...

Don't worry - you probably always will. :lol:
 
I shoot at 800 ISO a lot! Show us a sample image. :)
 
dazza might have the answer. I'll post up a couple of examples.

It's going to look like I'm crying over nothing when you see these because for the most part the noise has been lost in the jpeg re-size and compression but it's quite clear in the full scale images.

sky-reflections.jpg


bird3.jpg


bird4.jpg


bird5.jpg


I've just thought, apart from the high ISO it could also be due to the -1 exposure bias...

Panzer
 
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