6D Noise at ISO 100 in studio

Hi there

Please can you guys help.

I was just testing out my Studio strobes on a new 6D, and I as shooting a wine bottle in my home studio, at different exposures, but all at ISO 100, (the best exposure being at ISO 100, f11, 1/125th of a second). However, I can see fine light specks of noise on a dark area of the background on the Raw file, when zoomed in, in Lightroom.

The f11 picture was exposed correctly, yet zoomed in I can see those specks, in a dark portion of the background. Is this normal on the 6D at ISO 100? Every photo that I took that was more underexposed had the same issue, but worse, especially when I was very underexposed.

Using Luminance and Colour Noise reduction in Lightroom gets rid of the noise, yet, correct me if I am wrong, should there not be any noise at ISO 100, in dark areas of a photo?

Thanks,


D.

Can you post a photo for reference?

When you zoom in.... What sort of zoom percentage are we talking here? This sounds suspiciously like pixel peeping.

imbillkamal wrote in post #16953721
Can you post a photo for reference?

I can post a jpeg, but you will just see overly compressed Jpeg block compression and posterization. I don't think I can post the cr2.

Thanks.

gonzogolf wrote in post #16953730
When you zoom in.... What sort of zoom percentage are we talking here? This sounds suspiciously like pixel peeping.

I can see faint specks at 1:1 & more obvious at 3:1.

Of course you will see noise if you look that close on a subject that is underexposed, or just simply very dark. For low values of signal the signal to noise ratio is generally always much higher than for high levels of signal. A variation in the value of a single channel of a single pixel of +-3, is a 50% error when the signal value should be 6 and will be pretty noticeable. Increase that signal value to 128 and the error is only 2.3% or barely noticeable. This is why using Expose To The Right is a good idea in general. When you have a relatively dark subject, or even worse a well out of focus, but very dark background then using ETTR becomes really important. It enables you to increase the SNR in the dark areas without the need to use any NR. Of course you have to shoot RAW and only use non expanded full ISO stops. What it gives you is both less noise and potentially more detail in those shadows/dark areas.

Alan

Have you have applied some sort of shadow recovery during processing?

dcooper wrote in post #16953770
I can see faint specks at 1:1 & more obvious at 3:1.

At 300% magnification, if this is what you mean by 3:1, you are making your own noise via browser interpolation.

This sounds to me like you're pixel peeping. Stop doing that. It is the sure road to clinical depression and financial ruin. All for naught.

Coming from an XSI, I thought there was noise too at ISO 100. ...but then I back out and got a print made. It's the cleanest photos I have ever made.

MakisM1 wrote in post #16953829
At 300% magnification, if this is what you mean by 3:1, you are making your own noise via browser interpolation.

joedlh wrote in post #16953847
This sounds to me like you're pixel peeping. Stop doing that. It is the sure road to clinical depression and financial ruin. All for naught.

WORD

Thanks for your help guys.

My advice is to make a test print. All of the things you see wrong on your screen with regards to noise and artifacts usually don't show up on a print. There's also a conversion from pixels to dots that happens when you print so most of the sharpening artifacts you see don't show up unless it's overdone

joedlh wrote in post #16953847
This sounds to me like you're pixel peeping. Stop doing that. It is the sure road to clinical depression and financial ruin. All for naught.

Buahaha so true though

Canon_Shoe wrote in post #16955441
My advice is to make a test print. All of the things you see wrong on your screen with regards to noise and artifacts usually don't show up on a print. There's also a conversion from pixels to dots that happens when you print so most of the sharpening artifacts you see don't show up unless it's overdone

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