It was with great excitement that I unpacked my first monolight strobes, a pair of Flashpoint 1820a 900 watt/second strobes. Up until just recently I had always made due with continuous lighting — the lights that also doubled as video lights for video projects.

But of course I had all the problems that everyone has with continuous studio lights. With 1,750 watts of lights (requiring 2 circuits) I was still struggling to get better than 1/60th of a second at 24mm and ISO 400 on full shots. I just needed so much light. And of course they were hot.
The temperature in the room was easily 10 degrees higher within minutes of turning on the lights — and another 10 degrees in front of the lights. My models didn’t just have sweating problems — after a while they simply burst into flame, and as you can imagine this made cleanup a chore.
But model combustion aside, the bigger issue was brightness and what it did to my shutter speed. You can pretty safely guess that any studio shot I take that I showed to my father, the conversation will go pretty much like this:
WoodJr: Hey, here’s some recent shots I took.
WoodSr: They’re out of focus.
WoodJr: No… no they’re okay.
WoodSr: They aren’t tack sharp. Did you use a tripod?
WoodJr: … No. I couldn’t. I was suspended above the model from cables… in a 300 mph wind… underwater. I couldn‘t use a tripod.
WoodSr: Well that’s why they aren’t sharp. Camera blur.
But no longer! With these strobes I no longer have to care about shutter speed! They fire at the speed of light, c, 186,000 miles per second. Well, more importantly the flash duration is — optimistically, but I’m of an optimistic mindset with these strobes — 1/1000th of a second. Unless I’m using a crazy long lens, which I’m not, the studio room isn’t that big, there is no way I’ll get camera blur ever again.
I can finally show shots to my father and have him exclaim “Dear boy! These are as sharp as your very clever mind!”
So I quickly badgered a friend into posing as I tested out the lights. The weather was against us with a nasty and humid 92 degrees — so much for no more sweat — but I’m happy to report the model never once burst into flame.
And I was delighted with the strobes. They were bright. Stopped down to 1/4 power I was still getting f8 at ISO 100. It was fantastic! I had flexibility I’ve never had before. The lights didn’t have to be just on the outside of the frame. I could move them across the room if I wanted. And as they weren’t within a few degrees of the surface of the sun, I could toss whatever kind of filters or material I wanted over them.
Then I got back to the computer, to look through the shots, and saw several shots like this one:
This shot is… not sharp. In fact, it looks very much like blur caused by camera movement. Suspiciously so. But at 1/1000th of a second, that shouldn’t be happening. Okay, optimism aside, the low end of the flash duration is 1/600th of a second. Still plenty fast to stop any incidental motion.
Was it possible that I was legitimately out of focus? Does the auto-focus of my camera require adjustment? Are my strobes somehow insanely slower than they should be?
The only way to find out is to run some tests!
Part 2 of Strobe Misadventures: the disturbing results of some crude testing!