From what I've been able to glean so far from the test images and test charts is that Canon has "steepened" the curve across the ISO fulcrum. In that regard, it strikes me that we have the option to switch from "missiles to guns".
To me, it looks like if I plant the 6D2 on a tripod for landscape ... straight to ISO 50. If I'm chasing Bambi before the sun comes up or F16's screaming across the sky. Straight to ISO ^ XYZ as needed for the situation.
Test shots and charts have shown us something. Here's a 6 EV lift and a 4 EV lift from the darkest corner. Note the stray hair and scratches / imperfections in the board that weren't readily visible prior to the lift. Note the amount of noise that came along for the ride.
What ISO 50 will do in the wild ... yet to be seen. But, I keep lifting this file (different ways), and keep getting similar results. In the wild, we likely won't have the same WB of light, so the noise pattern may certainly change when we move away from full spectrum light (RGGB @ 4X pixels) vs. heavy blue light (B @ 1 pixel) in the shadows of landscape DR challenged scenes.
So ... if you don't want to buy this camera, don't. I'm going to buy it, and find out just how well it can do for me. I think that once you stop to understand how this camera was designed to be used ... despite it's "lacking ISO invariance", we may find that it serves the purposes of many just fine.
BTW ... I've gotta run, but if someone would like to take a D750 or other camera from the DPR download and ratchet it up 6 EV for comparison, some might that interesting. I'm mostly interested in what the 6D2 can do. I have no plans to switch out the glass lineup that I've spent years building, so for me, this tells me enough of the story that I will continue with my purchase. If I find early on that its as big a POS as others suggest, then I'll return it. If it performs at ISO 50, like I'm seeing here ... and at ISO 6400 as seen elsewhere ... it's a keeper for me.
Jul 25, 2017 at 06:55 AM
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