View Single Post
      05-03-2012, 11:44 PM   #6

Drives: 08 E90, 89 Grand Wagoneer
Join Date: Mar 2012
Location: So Cal

iTrader: (3)

Originally Posted by rodi View Post
the speed at which the flashes are on should be much faster than the speed in the water. something is weird.
so you're saying the markers are in focus, but when you use the cartridge, it's out of focus with the same exact settings?
Yes same settings.

Originally Posted by oneintheory View Post
you'll want to make the flashes full-power or at least 3/4 for starters. a more powerful flash has a shorter duration. now, if you have access to speedlites and can do high-speed sync, that would be even better. try increasing flash power and increasing the aperture size to f/10 or so.

how powerful are your lights?

Well the ones I was using are only 250 watts. I do have another set of 2000 watt lights however these were already set up so I thought I would give them a shot.

Originally Posted by Weebl View Post
You want lots of natural light but set your flashes at the lower end of power so they don't flash so long. High speed sync helps and lots of patience.

Google produced this:
"To actually get an "exposure", a flash is fired. The flash light duration will now become the actual

exposure time.

SO now we need to see how long does it takes the flash to fire. It turns out that the output power of the flash, actually affects the duration of the light, so to get exposure times. If you need exposure faster than 1/6000 seconds, the output needs to be reduced. For more information on the light duration please see the test I ran on my Sigma EF-500 flash."

You need enough background light and flash to illuminate your object and nothing else, otherwise you are wasting power. I'm not sure but I think this is where a large guide number will help. As you decrease the power the range decreases and eventually will fall short of your bowl of water but you will have a very high effective shutter speed.
I think....
Very good info. Thank you. Further experimentation is in the works.

Originally Posted by The1 View Post
high speed sync should be able to get you to 1/200 or 1/250 depending on the flash if you have such flashes. That extra little bit might just be enough to get it to where you want it.

otherwise, use bright lamps instead of flashes, then you'll have a constant high light source and enough to get the shutter speed you want. Also alowing you to bump the ISO up to help you get higher speeds.
This is actually what I was going to try next. I have some 200 Watt bulbs somewhere. Either that or I can just use my 2000 Watt Dynalite's.