GRAINY PHOTOS DESPITE LOW ISO

Scrulooose

Scrulooose

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53
Name
Ollie
Edit My Images
No
Hi,
I've recently been discovering more noise within my photographs whilst in post production in Lightroom.
I've been noticing small red 'dots' and other areas of alot of noise and grain.
Despite shooting at 100-200iso there still seems to be a presence of noise etc?
Does anyone have any idea why this is happening? is it something to do with my sensor?
Thanks in advance any info is appreciated!

http://www.oliverhenrymoore.co.uk/
 
Are you upping the exposure, clarity or shadows in lightroom?

Also, can you post examples?
 
The 40d should be fine at 200 iso, are the photos under exposed by any chance? that can push up noise a lot.
 
The most recent images are sliightly under exposed but not majorly. and yea im upping the clarity a tiny bit and shadows but not exposure in Lightroom.

If you look towards the right and down abit from the pillar with graff on it. There is a red dot, can you see?
http://24.media.tumblr.com/tumblr_mcde95Pxnf1rqn7t8o5_1280.jpg
im not very technical ha thanks for the response guys
 
That was shot at 30" 4.5 400iso. 400iso shouldn't create that much noise am i right?
 
The red dot is a hot pixel...not unusual with 30 second exposures.

Bob
 
longer exposures can also push up noise. 30 seconds could be introducing it a bit.
 
The ISO controls amplifier noise figures. However long exposures cause thermal noise in the sensor.
 
As has been said, long exposures (and 30" is one of those) will almost certainly introduce noise. In the menu there is probably a setting for "Long Exposure NR" - try turning that on and see if you lose too much detail (NR algorithms can reduce fine detail) or run the images through some NR software. I occasionally use Noiseware Community Edition (a free one) from (IIRC) Imagenomic.

The noise is nothing to worry about and is just a fact of life in digital photography!
 
Simon photo said:
like film grain, but not nearly as petty :wink:
Click to expand...

Just as petty but not nearly as pretty! :naughty: Never been a fan of grain in colour but a big fan of golfballs in Mono! (HP5 or even FP4 pushed to ISO silly!)
 
Try turning on Long Exposure Noise Reduction. It does a dark frame of the same length following the exposure and subtracts the dark frame noise from the exposure - or something like that. Anyway it should help.
 
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