« on: February 14, 2012, 12:17:38 AM »
SAMPLE TUTORIAL - SIMPLE LOCATION CROSS LIGHTING WITH MANUAL FLASH
Sort of came to mind after the flash discussions
might help some of the people asking about starting out with flash
This is a basic lighting concept with the subject sandwiched between 2 lights, the key light and the rim light
its particularly usefull for location shoots where you want the background as part of the shot and the background adds to the effect ie a sunset beach
Camera - 5Dmk2
Lenses - 16-35f2.8L II and 70-200f2.8L IS II
Flashes - 2 x 580 exii (its all manual so any flash could be used though)
Flash trigger - cheap ebay radio triggers (poverty wizards)
a flash stand and a 33" white shoot through umbrella
Shutter speed 1/125 (well within xsync for all cameras)
metering is set to spot
white balance is either sunny or flash (i cant remember)
wide shot 35mm on the 16-35f2.8
tight shot 200mm on the 70-200f2.8
The aim is to overpower the sun with the flash so the flash is the key light and the sun /sunset provides the rim / fill light.
The flashes are both set to manual and to full power connected to the top of the light stand on a multi flash bracket with the cheap radio triggers.
The flash stand with shoot through umbrella is located to camera right pointing toward the setting sun with the model in between approximate distance from the model is between 1m and 1.5m and the key light is above head height pointing towards the model.
Firstly to determine the exposure i simply spot metered the sunset sky and took a couple of shots to get the exposure set for the background. (depending on the light these settings will always be different usually 2 or 3 shots is all it takes to get your background exposure figured out. (dont worry about exposure for the model yet)
Once i was happy with the settings simply added the flash in to balance the lit model with the place the light stand in the correct alignment at a distance from the model and take a shot (make sure you have highlight alert on, ie the blinkies, so you can identify if you are blowing highlights) take a shot check the picture then move the light stand closer to the model if you need more light to balance the scene or further away if you are blowing out any highlights. . (also check your histogram)
It's very easy to tell from the LCD once you have the scene balanced and then you are all set up you can then shoot your poses even change lenses and change your shots.
if you only have one flash then the light will have to be closer to the model basically all you have to remember here is if you halve the distance of the light to the subject you increase your exposure 1 stop if you double the distance of the light from the subject you decrease your exposure by 1 stop. I used 2 flashes to let me keep the source further away.
there are other aspects of moving the light closer and further away such as quality of light etc (ie the further the light is away the more harsh the light and the closer the light the softer the light, based on it being a diffused light source from the umbrella)
but since this is a simple tutorial to help flash beginners out dont get too hung up on that
these shots are simply raw files brought into photoshop through camera raw, basic curves adjust, some contrast and clarity no adjustments to and colours or saturation, thats all done by the light.