Grainy photo's at ISO100?

[Thomas]

Is the grain just a given with 30 minute exposure? Any tips on how to shoot without the grain?

Exposure: 30 Minutes
Aperture: 32
ISO: 100

http://img688.imageshack.us/img688/1060/img6385u.jpg

[Glasshalffull]

id say its not grain its the 30 min exposure. As you can see there is movemnt in the photo. look at the shadow on the water. with a 30 min exposure slight dust on ur lens would show up wouldnt it

[Hades]

also the long exposure will generate a reasonable amount of heat causing digital noise

[Thomas]

Especially after doing a wet weather shoot with the same lens :) Thank's for the tip, I'm going to give it another go.

[Agrom]

Why do you need 30mins for this image,and will 1 min show the same as 30mins?
F32 seems overkill also.I would try for less exposure,should help with grain problem.

[Thomas]

I just purchased a remote and wanted to have a play around with longer exposures. This wharf is my test subject, its directly off my balcony. I must have a thousand images of the same subject!

Mods: Please kindly move this to the experimentation forum.

[Kazphoto]

Mods: Please kindly move this to the experimentation forum.

Done.... :)

[Ausnapper]

Agree with all the comments above, did you have any noise reduction set in camera, did you do any in post ?

Also noise will normally originate in the darker areas, so even a little overexposed, and then bring it back in post. That is why they say expose to the right :)

[MDSimpson]

Yes, digital noise caused by hot pixels caused by long exposures.
In camera, turn on Long Exposure Noise Reduction to 'almost' eliminate this, BUT you need to know, if you take a 30min exposure, the camera will take ANOTHER 30mins to process the image, so make sure your batteries are full before you start as if the battery goes flat, the image is lost...

[Supra_t]

There is a little extra info in here on a similar discussion
http://www.photoforum.com.au/showthread.php?36360-Learning-about-the-new-camera-coogee-by-night.

I too would question your settings, im sure you could get the same image with a much much shorter exposure and a wider aperture. At 100mm you would need to step down a little to retain DOF but your obviously not focused too close so you may even get away with f4 or something.