I just had a stroke of genius! Seriously! However, it’s going to take a bit of background tech-talk to explain…
Okay, first of all, let’s simply state facts:
Nikon SB800′s and SB900′s have a “Guide Number” mode, when pointed straight forward, in which you can simply dial in the subject’s distance and bang, a perfect exposure. Pretty nifty! (Well, for those few who like to shoot manually with their hotshoe flash pointed straight forward all the time…)
Similarly, in fully manual mode you still get distance calculations, except this time you’re not dialing the distance, you’re dialing the flash power and the distance reads out automatically…
…Now, when you use a flash off-camera and command it wirelessly via CLS, the commander will communicate to the remote through an IR signal that tells the flash how the camera is doing exposure-wise…
The commander can “ask” remotes to be automatic or fully manual.
You can dial +/- compensation into a remote that is in TTL mode, so the IR signal must be pretty high-tech…
I don’t know how this works exactly, but I know that at least the camera, if not also the wireless flash remote, knows which aperture, shutter speed and ISO is used.
The SB800 is at least capable of understanding aperture and ISO, because it uses them to calculate a guide number / flash distance…
WHAT IF, and this is a huge what if, …you could remotely command a flash distance?
Here’s how it would work. You’d set up your remote flash however you like, and take note of its distance from the subject.
Then you go onto the back of your on-camera commander, and input that distance for the correct remote group…
The IR signal from the commander says “expose for 10 feet at ISO 200 & f/4, please”
The IR remote thinks “okay, with my flash zoom head set to 50mm, that will be 1/8 power considering that I am an SB800 and my default GN is 125…” *pop*
Seriously, that would take a LOT of the guess-work out of my off-camera flash use.
TTL just doesn’t cut it when I’m doing an elaborate environmental portrait with intentional dark shadows and off-center subjects.
So, I use manual power a lot of the time. And when you’re shooting manual off-camera flash, it’s really a shot in the dark, pun intented. You know that you’re not going to be at full power because TTL was probably blowing things out as usual, so you start guessing at maybe 1/4 power. But if that is also blown out, there is no immediate solution apparent. Is it 2 stops blown out? Is it 3 stops? 4? 5? I have no idea. So I dial it down in one stop increments, until I get a proper exposure. Then the next time, I get fed up wasting time so I guess in 2-stop increments to begin with, and blow past the correct exposure, have to go back, and end up taking just as long. This doesn’t actually take TOO long and is easier than shooting film and calculating a GN by hand, but it’s still annoying.
AND, geeky solutions turn me on.
I know it might be a complicated IR signal to send. But the camera itself should be able to do most of the work, since it knows the aperture and ISO already. It can already spit out a flash distance if I input full manual 1/1 power, and I can already wirelessly command a manual flash power. So we’re at least VERY close to achieving this.
So, Nikon, why not?
Alright, maybe I just gave a way a brilliant concept that I should have quietly gone to a patent attorney for. Most likely though, this has already been contemplated many times over, and is either impossible to implement or is already on the way…
Either way it was exciting to conceptualize, and yet I’ll live without it. I’m just gonna work harder on being able to calculate a GN in my head. What’s that dang formula again? F stop = GN x ISO / distance… GN = F stop x distance / ISO… Eww…
=Matt=
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