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Re: [OM] iso-invariance - conceding

Subject: Re: [OM] iso-invariance - conceding
From: Frank <wijsmuller@xxxxxxxxx>
Date: Mon, 14 Oct 2019 11:16:31 +0200
At ISO 640 the Sony changes to a second 'base' ISO, which increases its
dynamic range. That might influence your results.

More on that here
<https://www.dpreview.com/articles/3389926460/sony-a7-iii-dynamic-range-and-high-iso-improve-over-its-predecessor>
.


Frank



Op ma 14 okt. 2019 om 00:59 schreef Wayne Shumaker <om3ti@xxxxxxxx>:

> My first test of pushing exposure - ISO invariance. A7iii shot at ISO 400
> and -3EV, hand held, stack of 5 images using Helicon focus, evening light.
> Post process that with +4EV exposure compensation and a little Topaz AI
> sharpen. Two other shots at ISO 800 +1EV on previous evening.
>
> https://photos.app.goo.gl/gb8icgGTNGkM5BV9A
>
> Maybe not a good comparison as it could have been darker the 2nd night.
> Again, for ISO invariance, if you have the dynamic range at higher ISO,
> seems that may be a better option.
>
> I would be curious to see the results if anyone else tries this technique.
>
> At 10/13/2019 12:45 PM, Moose wrote:
> ><...>
> >
> >{FF-rant: Comparing a dynamic range of FF sensor to u43, for example,
> a7r3 (or a73) is 11.64 at ISO 100 compared to GX9 is 9.75 at ISO 100,
> almost 2 stops.}
> >
> >----------------------------------
> >Anti FF-rant:
> >
> >Most subjects don't require that much DR.
> >
> >A camera with infinite DR that can't take the photo I want to take is
> useless.
> >
> >FF cameras and their lenses are heavy enough that I simply can't use them
> in the field
> >
> >With µ4/3, I can have an 800 mm eq, hand holdable lens. That doesn't
> exist for FF.
> >
> >I use a FL range of 14-800 mm eq. (Horiz. AoV of ~150° to 2.5°) and
> often switch FL a great deal from one shot to the next.
> >
> >A fair amount of what I shoot moves, so it's zoom or miss the shot.
> >
> >Using FF for my kind of field photography would be like using an 8x10
> view camera for flutterby photography.
> >----------------------------
> >
> >I DO have a FF A7 for other sorts of photography, but would no more use
> it for my general photography than I'd use a howitzer for hunting cheetahs.
> >
> >Moose D'Opinion
>
> You have good points and I am still looking for the right smaller camera.
> Here in the desert I find the dynamic range useful.
>
> Since I have Sonnie now, an APS-C Sonnie seems the best option for me, but
> the GX9 is also enticing. A lot comes down to lenses. I had, before giving
> to grand daughter, a6000 with 18-135. An APS-C lens on a7riii will crop to
> APS-C and be almost as small an outfit. On the a7riii would be 18mp and
> still have the higher PDR of that sensor.
>
> So I do like my howitzer. I was out on my mountain bike with A7Riii and
> 24-105 today. It was a bit bulky, heavy in the camelback, but less so than
> the 3L of water I carried/consumed. Some shots for the day...
>
> https://photos.app.goo.gl/XT5dq7R5Fonj62nc9
>
> I never new what the inside of a Saguaro looked like until I moved to AZ.
> I used to think the cowboy in the desert could hack into a cactus for
> water. Now I know that is a myth.
>
> WayneS
>
>
>
>
>
> --
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>
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