So, what does synch speed do?
If your camera has a mechanical shutter that’s a focal plane traverse shutter (leaf shutters on medium format (MF) cameras don’t really have a synch speed, but they may have differenct “synch” settings, and on MF cameras it is usually called X synch). What happens is the shutter opens, then the rear curtain closes. If the rear curtain closes too fast, you’ll have a nice,perfectly black area on your photo. Most modern cameras won’t let you exceed the synch speed and older cameras have the synch speed marked in red on the shutter speed dial. Higher synch speeds (1/200th or higher) are usually only found on higher end cameras, namely dSLRs. Some of the nicer dSLRs have up to 1/500sec synch speeds. This is useul if you’re trying to catch action with a strobe and need a fast shutter speed (and a flash). Aperture controls how much light reaches the film or the digital sensor. For flash exposure, aperture is the primary exposure control. Close the aperture (larger f/ number) for less flash ex
