Tom Reichner wrote in post #18989579
.I keep waiting for a foolproof exposure mode, and I think that perhaps a 5D V would be the camera that introduces it.
My foolproof exposure mode would be an expose to the right mode, in which the user sets an adjustment that determines how many "blinkies" are acceptable.
. This, of course, would be based on the jpeg generated from the RAW file.
It would give as much exposure as possible, without exceeding the blinky limits that you set.
You could set it by gross number of blinkies - set it to no blinkies at all, or that a maximum of 500 pixels could be blinkies, or that a maximum of 1,000 pixels could be blinkies, or 1500, or ..... all the way up, in increments of 500 pixels.
Or you could set it on number of adjacent pixels that are blinkies.
. In this mode, it wouldn't matter how many total blinkies are in the frame, but rather how many adjacent pixels are allowed to be blinkies.
. You could set it so that no two adjacent pixels can be blinkies, or that no more than 2 adjacent pixels can be blinkies, or no more than 3, or 5, or 7, or 10, or 12, or 15, or 20, and so on.
Yes, I've desired this type of control for years. Manufacturers seem only interested in replacing film, though, as if ETTR did not exist or make sense.
I do not understand why this has not already been created and implemented in every camera. . We already have the technology that is needed - we have cameras that generate blinkie signatures on every frame that we capture. . So it would seem to me that all that would have to be done is for software to be written that would base the exposure on a preview of what the image is going to be. . I bet a team of 10 or 20 software engineers could write all the code for this in just 6 or 8 months.
A lot of the things that we wish for in cameras, but are absent from them, are not absent because they are difficult, but rather, because the manufacturers are being conservative and difficult. Take limits to shutter speeds in Av or P mode, or limits to f-number In Tv or P mode, or auto-ISO in M mode; look how long they took to get into cameras, but they are extremely easy to program. The latter is as simple as re-ordering a very simple equation; as soon as I realized that for a given exposure, my EOS 10D gave the least noise with the highest practical ISO (regarding highlight clipping), I envisioned auto-ISO in M mode, to take advantage of this. The equation just gets re-ordered so that ISO is alone on the left of the equation, instead of shutter speed, or f-number.
All you have to do in this specific request we have here is examine a histogram that isn't clipped too much already, and derive a new clipping point that meets your requirements, and take the next shot with the exposure that would put that at the actual clipping point of the RAW. I would guess that the most difficult thing about implementing new exposure paradigms is not the coding, but working the feature into the corporate roadmap and file metadata standards.
Hard to believe this hasn't already been around. . If we had this exposure mode in our cameras, and learned to use it effectively, it would literally be impossible to ever miss proper exposure ever again (provided one has plenty of light and is not needing a given shutter speed or aperture).
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I would call that "optimal" exposure; "correct" implies meeting a specific exposure index target, like the ISO exposure index implied in the setting, or some pre-determined offset from it, like always shooting "ISO 100" at an ISO 64 exposure index that would give a good Kodachrome 64 slide (possible, actually, with almost all recent digital cameras, some of which can handle ISO 40 or even ISO 32 exposure, with even lighting and matte subject matter, if they have dual conversion gain, which increases full-well capacity at base ISO). With what we are wishing for here, the ISO exposure index becomes variable in the result. With the camera set to use ISO 100's gain, for example, the specular highlights in a chrome sculpture might result in an ISO 458 exposure, and a grey cat on a black couch might result in ISO 23.