Normally you would be triggering an external flash, while the shutter is open using a cable release with the camera in 'bulb' mode. Once the flash goes off, you let the shutter close. This requires the room to be darken because the shutter will be open for many seconds.



In this setup you can have the room lights on because the flash and shutter are triggered at the same time, and the exposure is set for 1/10,000th of a second.



Before we hook the camera up to the trigger circuit we first adjust it's settings, manually taking pictures until we get the exposure correct.



Mount your camera on a tripod and place a stationary test object right where the drop is going to land. Frame the test object, and adjust zoom to your liking. Use the macro setting if your camera is close enough to do so.



Keep in mind that you will most likely get milk splashed onto your camera and lens, so the Dollar Store glass plate should be placed in front of the lens to prevent this. If the glass plate is in front of the flash it may reflect back into the lens, causing unwanted glare.



Now take a test shot and revue how it turned out. If the shot isn't properly exposed adjust the exposure, flash and ISO until it is.



You can also adjust the shutter speed, but keep in mind that it's mostly the flash that's freezing the action. I set the shutter speed to 1/10000 of a second and left it alone.



On my A470 aperture override is not available. In its place is ND Filter State. ND stands for Neutral Density filter. Some cameras don't have an iris, but instead have a filter to adjust how much light enters the camera. If your camera has this instead of aperture override you won't have as much control over exposure because there are only three settings: [In], [Out] and [Off].

