I know…it probably isn't unfair to title this article “How I fooled 316 photographers” but nobody would have clicked on it if I named the article “How nobody on Facebook correctly guessed the aperture and shutter speed of this photo even though it was really tricky.”
The background story
I was on a big shoot two weekends ago with multiple models and multiple assistants. Â One of the models is a great dancer, so I decided to do some edgy portraits of her dancing around the studio. Â Then, we decided to try something fun and make a shot of her like a rock star (the photo featured on this page). Â So, we grabbed a few flashes, gelled them with various colors, and put them behind the model. Â Since I short one flash (my fourth got knocked into the lake earlier this day), I had an assistant shine a cell phone on the front of the model for a little fill light (I know… totally low budget, right?).
The photos looked cool, but we needed something with more action, so  I asked the model to swing her hair around and rock an air guitar (probably not what she had in mind when we agreed on $20/hour for her modeling services).  Anyway, it made for a really fun shot.
When taking the shot, I used some NON-traditional camera settings just to prove a point. Â As a teaching experience, I uploaded the shot on the Improve Photography Facebook Page and held a little contest to see what member of our community could guess the shutter speed and aperture.
316 photographers submitted guesses in the contest… but none of them were right. Â In fact, none of them were even close. Â Here is how I “fooled” all of them.
The answer
During the shoot, Â one of my assistants asked what shutter speed I was using to freeze the action of the model's hair. Â I responded, “It doesn't matter!” Â Obviously, a discussion ensued. Â How could it not matter what shutter speed I was using? Â The hair was moving very fast, so a slow shutter speed would ruin the shot, right? Â Not at all.
In fact, (drum roll) the shutter speed I used on this photo was 1 second. Â Yes, a full second. Â The aperture was f/8 and the ISO was at 800.
How did you do that with a slow shutter speed?
The photo was taken in a studio with all of the room lights turned off. Â Because it was completely black in the room, only the flashes illuminated the model. Â A little-known fact about flashes is that they only light up for only a tiny fraction of a second. Â The duration of a flash completely depends on the particular speedlight, but suffice it to say that it is VERY fast (around 1/1000th of a second).
So, if the scene is completely black during the exposure for only the instant that the flash emits its light, then it makes no difference what the shutter speed is. Â It doesn't matter if the shutter speed is 1/200th of a second or 5 seconds.
In defense of all entrants in the contest…
Because the shutter speed doesn't matter, it was impossible to know the camera settings by just looking at the picture. Â The most common guess sent in by readers was f/8 at 1/200th of a second. Â The reason that most people guessed this is that f/8 is often the sharpest aperture and 1/200th of a second is a common flash sync speed. Â If you are flash sync speed illiterate, check out this article that explains it in easy-to-understand terms.
HOWEVER, I would have given the prize to anyone who saw the trick and simply wrote in that the shutter speed didn't matter, or anyone who guessed a slow shutter speed. Â Nobody did. Â Not one person. Â I gave the prize to the closest person, though.
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