John Reed

John Reed

York, North Yorkshire

Mine is a lifelong interest since the days of watching prints emerge in chemical baths -mainly landscape and the natural world. I find inspiration in the work of many photographers, but it was Eliot Porter who opened a door to seeing more in our wond...
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  • John Reed
    John Reed
    Participant
    Posts: 3
    Why ETTR May Be More Important Than Ever
    on: March 18, 2022 at 12:13 pm

    As ever, Harvey nudging us to be a bit more systematic – thank you! I too mostly use the blinkies on my a7r4, but the raw always has a bit of headroom that seems to be variable. In some images I seem to have thrown away a full stop from my potential exposure to the right, which is just what Harvey shows is worth retaining. There must be a fundamental technical problem with deriving blinkies and histograms from the raw data, which would be ideal.
    I have assumed that the blinkies and histogram are derived from the live video feed to the viewfinder, which is reduced in resolution and dynamic range compared with the raw image. Erik suggests that it’s JPEG based, which I had not thought of because that is a still image compression. Either way the camera is using some unseen criteria to reduce the dynamic range and I guess that brings in the variable raw headroom compared with the blinkies.
    I’m going to continue to base exposure on blinkies, but whenever I have the time it’s got to be worth making an extra exposure a stop above indicated , just to see if it’s not clipped and gives a better image when processed.

    John Reed
    John Reed
    Participant
    Posts: 3
    Re: Are these still true?
    Reply #1 on: May 11, 2021 at 1:55 pm

    Interesting questions – I have certainly been instructed to obey all three over the years. I have stopped bothering to turn off image stabilisation and have not had any problems – Sony a7r4. Given the speed of response, especially from IBIS, might it not still be helpful when strong wind gusts can cause a little movement even with a solid tripod? When I’m next out with a long lens and a gale I plan to test this idea.

    I have deleted images in camera since my first 4mp Olympus and never had a problem. I do format memory cards, so would be pleased to know whether I can also abandon this practice too!

    A truism that has passed its sell-by date is not being able to assess depth of field in low light through the viewfinder when using small apertures. Some DSLR viewfinders were better than others – eyes also – but those of us who have gone mirrorless know the power of WYSIWYG….
    JMR

    John Reed
    John Reed
    Participant
    Posts: 3
    Re: Praia de Carnota
    Reply #2 on: August 22, 2019 at 4:57 am

    Wonderful balance – you have movement here in such a peaceful, calm scene.