Papilio ulysses

Images taken in a controlled environment or with a posed subject. All subject types.

Moderators: ChrisR, Chris S., Pau, rjlittlefield

Guppy
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Post by Guppy »

Hi Chris, hi Marco

Yes, sorry I made a mistake, the correct histogram in RawDigger looks like this:

Image

Kurt

rjlittlefield
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Post by rjlittlefield »

Ah, OK.

So, you're leaving quite a lot of extra space on the right, about 2 1/2 stops?

--Rik

Guppy
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Post by Guppy »

Hi Rik

I wanted to keep the flash-burn time short.
An underexposure in RAW format is not tragic.
The noise of a Nikon D810 can be removed very easily at 60:1.
I could have also increased the ISO number.

Kurt

rjlittlefield
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Post by rjlittlefield »

Guppy wrote: I wanted to keep the flash-burn time short.
An underexposure in RAW format is not tragic.
The noise of a Nikon D810 can be removed very easily at 60:1.
I could have also increased the ISO number.
Understood, makes perfect sense.

The D810 falls into the category of cameras that is called "ISO invariant". This means that noise levels are the same regardless of whether you increase the ISO or shoot at low ISO as raw and then levels-shift to make up the difference.

See https://improvephotography.com/34818/iso-invariance/ for discussion.

--Rik

Guppy
Posts: 114
Joined: Mon Dec 20, 2010 10:36 am
Location: Switzerland
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Post by Guppy »

Hi Rik

(The D810 falls into the category of cameras that is called "ISO invariant")
There is a lot of writing, I measured it myself years ago up to ISO 2000, it is indeed so. :D
In my comparison, a subsequent brightening was minimally better from ISO 500 on, like higher ISO numbers.

An important difference with Focus Stacking.
If you choose a higher ISO number, there is the possibility of overexposure.
If the pictures are a little too dark, you can adjust the brightness after stacking (Zerene).

Kurt

marcojongsma
Posts: 15
Joined: Fri Feb 22, 2019 3:12 am

Post by marcojongsma »

Guppy wrote:Hi Chris, hi Marco

Yes, sorry I made a mistake, the correct histogram in RawDigger looks like this:

Image

Kurt
Thank you so much Guppy now i now a little bit more you make the stack in raw so you can post processing it more if it is possible too show us the unedit version or a single shot regards marco

Guppy
Posts: 114
Joined: Mon Dec 20, 2010 10:36 am
Location: Switzerland
Contact:

Post by Guppy »

Hi Marco

Here is the unprocessed image.
Image

Kurt

marcojongsma
Posts: 15
Joined: Fri Feb 22, 2019 3:12 am

Post by marcojongsma »

Guppy wrote:Hi Marco

Here is the unprocessed image.
Image

Kurt
Thank you so much for sharing your experience Guppy
it gives me more details about the process and lighting
i will do some new tests this week and change something about my workflow.
i post the results soon here

ps also the pictures on your website are beautyfull

regards marco

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