rrcphoto said:
you would have stack more to if you were ETTR'ing and exposing for highlights on the D800 versus a normal balanced exposure and bracket on the 5D, so if you wanted to move your exposure -3EV on the D800 to expose for the highlights, and then pull up the shadows by 3EV, then you'd have to have 3EV more ND in front to maintain the same ISO and shutter speed.
I think you have things backwards. You ETT
L to preserve highlights. ETTR pushes the histogram to the right...TO the clipping point. If you are having problems with your signal clipping, you do the exact opposite...shift your histogram to the LEFT, reduce it, pull the highlights back out of the clipping point. If my highlights are clipping when I expose 1s f/16, then all I would have to really do is drop in a 2-stop ND, and that would correct the problem. I would do EXACTLY THAT, regardless of the camera...because 1s f/16 is the same regardless of whether I am using a Canon, Nikon, Sony or any other brand of camera. When you expose for the highlights, you expose for the highlights. The shadows SUFFER as a result.
Now, with the 5D III, by dropping in that 0.6 ND, I've pushed my shadows, which were likely already hovering just above the read noise floor, are now pushed two stops into the read noise floor. On the D800? They are pushed down two stops to...just above the read noise floor.
There is no handicap to the D800 here. I want a 1s f/16 exposure, because that's what will get the the amount of water blur I want. I don't mess with the exposure...I use a solid ND to get what I want. That may be a 1-stop, 2-stop, maybe even a 3-stop ND filter. If I REALLY want to go dreamy, and blur everything, leaves moving in the wind, clouds, and the water, I could go for the 10-stop "Big Stopper"...however I think that's more useful for coastal photography.
rrcphoto said:
to be honest though - i'd take one shot that blew the snot out of the sky and just replace it.
but honestly if you are struggling so much and you feel it's the camera - why on earth aren't you using an A7R or even an A7 with an metabones adapter for your current lenses and your problem is resolved. (outside of sony's clunky RAW and bracketing mind you)
especially just an A7, shove it in your kit for the times you feel you need that extra bit of DR lattitude. Sony can barely give the things away now - I think I've seen them used for around 1K.
No offense but it really seems like alot of wasted time and effort discussing it when you have a fairly cheap solution that uses your current lenses.
I'm a technical guy. As you can see, I quibble and fret over technical details. One thing about Sony that REALLY irks me is their so-called RAW files. They are LOSSY-compressed, and there have been plenty of demonstrations, particularly of landscapes, of their compression introducing artifacts into the RAW. If their messing with the RAW data coming off the sensor, and reencoding it with a different storage structure (which is what they do), then I also suspect that those files will have similar editing latitude issues as the Canon sRAW and mRAW formats do. Both sRAW and mRAW use a compression format, which is also lossy for color. It's a YCbCr format, where full luminance and either 1/2 or 1/4 the color data (depends on whether your small or medium RAW) is encoded for each pixel.
I shot with mRAW for a couple months after I first got my 7D...those files have NOWHERE NEAR the amount of editing latitude as a real RAW. The primary ranges of exposure, the shadows, midtones, and highlights, effectively get "pinned" to a limited range. With a real RAW, I can pull bright highlights right down into the shadows, and I'll get a very dark or low-key image. With an mRAW, I simply cannot do that. I can try, but there is always a part of the bright highlights that just won't move down beyond a certain level. Same goes for shadows...I can lift them, but I cannot lift them beyond a certain point. With RAW, if I want to make certain midtones bright highlights, or even nearly-clipped whites, I can...not with mRAW. I can push and pull the midtones around within the general range of midtones, but I cannot push them very far. Not without moving the entire exposure up or down.
So, no, sorry.

Not interested in any Sony cameras until they stop using a LOSSY "RAW" image format. That's just inane. They build a twenty billion dollar image sensor monstrosity that is cranking out some of the best sensors the world has ever seen...then they turn around and gimp the whole operation for themselves by lossy compressing their data? Just plain stupid. :
If Sony remedies that situation, then I'll gladly look into their mirrorless camera as a landscape camera. It would be nice to lighten the load a bit as well. Since I manually focus my landscapes anyway, the AF issues and such with the Sony wouldn't be an issue. Oh...I guess the only other requirement I would have is...do they support live-view tethering? Now that I've done that with my Windows 8 tablet...I really don't think I could do it any other way. It's like the digital version of a large format field camera...without the upside down image.
Finally, I hope the time is not wasted. Canon needs to get a move on and give their landscape photographers (and anyone else who shoots anything that can make use of more DR) a high resolution, high DR camera. So we don't have to deal with things like Sony hackRAW or adding an expensive new set of Nikon lenses and a D800 to our kits (especially when we may already have lenses...I already have the 16-35 f/2.8 L II...to add a D810 for landscapes, I'd need a lens as well...the 14-24 is the logical choice...but, lot more cost than adding just a Canon body that did what I needed.) I'd hope that people who need more DR for their work would get on the bandwagon and start being vocal about their need, just in general on the net, to Canon directly, etc.
The members of this site seem deeply steeped in the notion that there is nothing better than a Canon full frame camera...period. The benefits of less read noise on DR and editing latitude are not really benefits. Sensors with smaller pixels don't really resolve more detail. There are no better lenses than Canon's. The only thing you could ever possibly need is a Canon full frame camera...it'll literally do everything you need, and any improvement over a Canon FF is just a fantasy, a dream, a farce, a lie.
In that light...your right, it's futile and I'm wasting my time. I hear hummingbirds...I'm going to see if I can photograph them.