ISO Invariance

[Karsaa]

Here as promised:

6400 4s f/1.8

6400 by Kari, on Flickr

800 4s f/1.8 +3 exposure

800 by Kari, on Flickr

[Kayaker72]

[/LEFT]

Sounds familiar to the old DR discussions. Sony is obviously better.

Most of the discussion is centered around camera bodies. Really that may only be half of the equation in the discussion. Don't you think it would be just as important to understand what is happening with your PP software? Or are we assuming all PP programs are equal and as such invariant? Do all the PP programs simulate the gain boost just like the camera?

Ha that sounds like another rabbit hole that I could spend awhile exploring. Which software is better. I will say, I did come across the following by Thom Hogan while reviewing the sensor performance:

Here, he talks about the ISO invariance and brings up the software as well. Fairly interesting, his point (and the point of other program developers) is that programs like adobe operate as 16 bit even though our computers are typically 64 bit. This is to cut down on computational time and enhance the speed of processing. Granted, our files are 14 bit, but the articles point is that information is lost and working in higher bits is better for overall accuracy. They talk about RAWDigger and "Raw Photo Processer" being more accurate. Granted, he consulted at least one of the software engineers behind those processers for the article.

Then Here, Thom states his opinion as to the best software varies by manufacturer, adobe caters to the largest (i.e. Canon), while Capture One has some deal going with Sony, etc.

Here as promised:

Thanks....the biggest difference is the purple streak going across the top of the scene in the ISO 800 shot +3stops. Contrail from a plane that went by?

Otherwise, I still give it slightly to the native ISO 6400 shot. A bit more pattern noise while adding 3 stops to the ISO 800 image. I did have to look on flickr and zooming in helped, so close, but I'd give it to native ISO.

Great colors by the way, the subtle transitions are excellent (oops, I know, I just talked about actual photography in a technical discussion...my bad....)

[Busted Knuckles]

Jrista has some heavy cred in the astro stuff on c.rumors, i suspect he gets sensors way more than most.

I miss Dans comments always helpful, wish he would hang out here.