The Beginners Questions Area

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.

Yep, the raw files can help verify the authenticity and legitimacy of those images.

Knock yourself out boys.
1drv.ms/i/s!ArStsPjQ301PmRUe49DZTOs1w3ht?e=jgJIbV
1drv.ms/i/s!ArStsPjQ301PmRT4oVSiLLPUqGZ8?e=rzXWDo

are you saying there is a third setting thats is calculated for exposure ? sorry im just being a pain in the a..s 😁

I know what a jpeg and tiff are worth here Don, I would sting them like a wounded bull for a RAW. Next they will want exclusive rights as well 😉

You quoted the definition "exposure - amount of light that struck the sensor per unit area while the shutter was open".
That means that exposure depends on shutter speed, aperture, and scene light.

isnt the sony a74 amazing at iso 2000 , i love this camera as i shoot and video my daughters live gigs with it its on another level compared to other cameras ive owned. iso 12k is amazing as well.

As I thought, different exposures. Less exposure at ISO 2000, therefore more noise.

I'll pre type something for you Don and send it to you mate. I bet it happens ;-)

There is a third just as your images show but it was not the iso setting that increased the noise.
It was the difference in the size of the exposure that was the cause

What is the meaning of the word exposure you used in your question?

Aperture, shutter speed and scene luminance affect exposure*

* 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.

really, 3 things now .

not my quote. re-read what i posted

I have always posted Aperture, shutter speed and scene luminance affect exposure*

What is the meaning of the word exposure you used in your question? because in other threads you said that exposure was how light or dark an image looked on the medium it was being viewed on.

* 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.

is reflected light exposure now !

You posted this, but I changed the bolding to the relevant part of your post:

Whatever, if you change the scene lighting, you change the exposure. This has been mentioned several times.

P.S.: I am responding mainly for the benefit of others following this thread. Looking at DonaldB's history at DPR (aka Dspider, aka River Photography et al.), his mission on any forum is clear.

go and re-read some of your last posts. you will find it.