• Members 3930 posts
    April 20, 2023, 3:46 a.m.

    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.

  • Members 1737 posts
    April 20, 2023, 3:49 a.m.

    Please post links to the raw files.

  • Members 3930 posts
    April 20, 2023, 3:52 a.m.

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

  • Members 2305 posts
    April 20, 2023, 4:03 a.m.
  • Members 2305 posts
    April 20, 2023, 4:07 a.m.

    are you saying there is a third setting thats is calculated for exposure ? sorry im just being a pain in the a..s ๐Ÿ˜

  • Members 435 posts
    April 20, 2023, 4:10 a.m.

    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 ๐Ÿ˜‰

  • Members 457 posts
    April 20, 2023, 4:10 a.m.

    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.

  • Members 2305 posts
    April 20, 2023, 4:12 a.m.

    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.

  • Members 457 posts
    April 20, 2023, 4:17 a.m.
  • Members 435 posts
    April 20, 2023, 4:18 a.m.

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

  • Members 216 posts
    April 20, 2023, 4:19 a.m.

    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

  • Members 3930 posts
    April 20, 2023, 4:25 a.m.

    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.

  • Members 2305 posts
    April 20, 2023, 4:36 a.m.

    really, 3 things now .

  • Members 2305 posts
    April 20, 2023, 4:38 a.m.

    not my quote. re-read what i posted

  • Members 3930 posts
    April 20, 2023, 4:42 a.m.

    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.

  • Members 2305 posts
    April 20, 2023, 4:43 a.m.

    is reflected light exposure now !

  • Members 457 posts
    April 20, 2023, 4:46 a.m.

    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.

  • Members 2305 posts
    April 20, 2023, 4:46 a.m.

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