Noise
Feb 6, 2017 14:24:40 #
If instead of increasing the ISO, you keep the ISO constant but increase the exposure compensation adjustment (I have a D7200) would the noise aspect be the same or less?
Feb 6, 2017 14:31:12 #
Temuna wrote:
If instead of increasing the ISO, you keep the ISO constant but increase the exposure compensation adjustment (I have a D7200) would the noise aspect be the same or less?
I think it depends on how you have the camera set up. Either of the three, Aperture, Shutter Speed, or ISO would be changed.
Feb 6, 2017 14:32:19 #
ricardo7
Loc: Washington, DC - Santiago, Chile
Keep in mind that all the exposure compensation does is underexpose or overexpose. If you are underexposed too much
and attempt to correct the exposure in PP you will see noise.
and attempt to correct the exposure in PP you will see noise.
Feb 6, 2017 14:34:06 #
Temuna wrote:
If instead of increasing the ISO, you keep the ISO constant but increase the exposure compensation adjustment (I have a D7200) would the noise aspect be the same or less?
The Exposure Compensation adjustment changes the output of the light meter. What that does depends entirely on how you have configured the camera. If using a "Program Mode" it's hard to predict. If using Aperture Priority, meaning the shutter speed is on Auto, the shutter speed will be adjusted. The opposite is true for Shutter Priority, where the aperture will be adjusted. And if exposure is in Manual Mode and you have AutoISO enabled the exposure will not be changed but the ISO will be. Or, if AutoISO is off and exposure is in Manual Mode, the only thing that changes will be the light meter's indicator.
The overriding point though is that increasing ISO increases noise and increasing exposure reduces noise.
Feb 6, 2017 14:38:17 #
ricardo7 wrote:
Keep in mind that all the exposure compensation does is underexpose or overexpose.
Exposure Compensation doesn't actually do that. What it does is adjust the light meter output. That may have no effect other than moving the meter up or down. It depends on what the camera is configured to have controlled by the light meter.
Feb 6, 2017 14:41:07 #
ricardo7 wrote:
Keep in mind that all the exposure compensation does is underexpose or overexpose. If you are underexposed too much
and attempt to correct the exposure in PP you will see noise.
and attempt to correct the exposure in PP you will see noise.
Yes but it over/under exposes by changing the Aperture, Shutter Speed or ISO depending on how the camera is set up.
Feb 6, 2017 14:47:21 #
Of course, and with a few moments of thought before I typed, I would have figured that out. Thanks.
Feb 6, 2017 15:22:04 #
Temuna wrote:
If instead of increasing the ISO, you keep the ISO constant but increase the exposure compensation adjustment (I have a D7200) would the noise aspect be the same or less?
Significant under or over exposure, regardless of how implemented, may cause unwanted noise. It's as simple as that.
Feb 6, 2017 15:31:28 #
Temuna wrote:
If instead of increasing the ISO, you keep the ISO constant but increase the exposure compensation adjustment (I have a D7200) would the noise aspect be the same or less?
A lot of people are probably tired of hearing me say this but the only way to effectively reduce noise when you capture an image is to increase the exposure. More exposure, more signal and the higher the ratio of signal to noise, S/N. How you get there does not matter.
I have posted a series of articles on this topic including What is the Camera's Dynamic Range? - Part 2 which shows that visible noise is constant for a constant exposure.
Changing the ISO while keeping the total exposure (aperture and shutter speed) constant will not change the S/N but it will affect the numeric values that end up in the raw file.
In What is the Camera's Dynamic Range? - Part 3 where you can see how the raw file values change as you change the ISO but keep the same exposure.
Feb 6, 2017 18:12:22 #
Feb 6, 2017 18:42:31 #
Rongnongno wrote:
*sigh* And the crap is being publicized again.
What would we do without your insightful commentary?
Thank you for keeping my threads alive with your posts.
You just reminded me to add the correction: The companion images for these histograms are displayed on page 2 of the thread What is the Camera's Dynamic Range?
Feb 7, 2017 05:48:31 #
I keep my ISO to 200, so I never have a problem with noise, in certain lighting condition if the exposure in too long for hand held I open the aperture up and if necessary up the ISO to 400.
Feb 7, 2017 06:29:56 #
johneccles wrote:
I keep my ISO to 200, so I never have a problem with noise, in certain lighting condition if the exposure in too long for hand held I open the aperture up and if necessary up the ISO to 400.
The simplest solution is usually the best one.
Feb 7, 2017 06:48:21 #
selmslie wrote:
The simplest solution is usually the best one.
Thanks Scotty, my Olympus camera will not go to a lower ISO, but it's good enough for me.
Feb 7, 2017 07:14:20 #
leftj
Loc: Texas
selmslie wrote:
What would we do without your insightful commentary?
Thank you for keeping my threads alive with your posts.
You just reminded me to add the correction: The companion images for these histograms are displayed on page 2 of the thread What is the Camera's Dynamic Range?
Thank you for keeping my threads alive with your posts.
You just reminded me to add the correction: The companion images for these histograms are displayed on page 2 of the thread What is the Camera's Dynamic Range?
Yeah - this is the guy (Rongnongno) that a couple of weeks ago engaged me in a back and forth because he insisted on misinterpreting a statement I made and then accused me of being the one who initiated it. He is a bonified jerk.
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