The Beginners Questions Area

I have one of the old glass plate cameras, i was given it last week and its a museum piece worth $1500 ama zing peice of kit where you load 6 plates into it and they fold down after the exposure.

This has nothing to do with wrong things, especially when the correct things are easier and more productive, and, most of all, help creativity.

Could you please demonstrate how increasing ISO affects noise?

I could show pics at iso 100 without noise and pics at 6400 with noise. I’m not sure I understand what you mean by “demonstrate.” Unless I missed context earlier…which with a thread this long is quite possible…LOL

With the same exposure?

The question is, where'd that noise come from? Was it due to a lack of exposure, or a the high ISO setting?

Actually, I think it would be useful, and gives a possibility to discuss the reason for the difference in noise.

Your a push over 🤣

Did you change the scene light? Use an ND filter? Then it is not the same exposure.
In all my tests, the same exposure showed equal or less noise with higher ISOs (same scene lighting).

Here is an image taken at ISO 51200. See the difference in the noise between white horse and background? Same ISO. Why?

The answer is yes.

The high iso revealed the noise that’s there due in part to the insufficient exposure. But holding the iso lower and raising the ‘exposure’ in post would reveal the same (or often worse) noise.

I copied and pasted this information from an expert photographer ,so it must be right .🙄🤨

• exposure - amount of light that struck the sensor per unit area while the shutter was open
  optimal exposure - the maximum exposure within dof and motion blur requirements without clipping important highlights.
  under exposed - more exposure* could have been added with the DOF and blur constraints still being met without clipping important highlights

so are you telling me he is wrong ?

Those are the definitions I choose to use. Other people might choose to use different definitions.

Some people define exposure as meaning how light or dark an image looks. But then their heads begin to spin when I tell them that I can change the image lightness in camera while keeping the exposure* constant 🙂

* exposure - amount of light that struck the sensor per unit area while the shutter was open
** optimal exposure - the maximum exposure* within dof and motion blur requirements without clipping important highlights.
*** under exposed - more exposure* could have been added with the DOF and blur constraints still being met without clipping important highlights.

You can find the answer at Why Are My Photos Noisy?

This might help

en.wikipedia.org/wiki/Image_noise

I assume you changed the scene light and therefore changed the exposure (the amount of light reaching the sensor).

Aperture, shutter speed and scene luminance affect exposure*

If image lightness, aperture and shutter speed between 2 images is the same and ISO has changed then so has the exposure* changed.

* exposure - amount of light that struck the sensor per unit area while the shutter was open
** optimal exposure - the maximum exposure* within dof and motion blur requirements without clipping important highlights.
*** under exposed - more exposure* could have been added with the DOF and blur constraints still being met without clipping important highlights.

Please post links to the raw files.