In addition to TTL flash, CLS is a complex system of master and remote wireless flashes. There can be up to a total of three groups (A, B and C) of wireless remote flashes that can be controlled independently with different exposure compensations.
TTL FLASH METERING
Most current SLR flash systems employ some form of through-the-lens (TTL) metering.
TTL Flash: Through the lens flash metering. Sensors located in either the prism, the mirror or on the film plane which record the amount of electronic flash coming into the camera at the time of exposure.
TTL Flash Metering For Macro Photography
TTL (through the lens) flash metering setups for macro work are very nice. However, you must be careful not to exceed the minimum flash to subject distance allowed for TTL mode with the flash unit.
TTL flash metering
With TTL flash metering the flash light and ambient light is measured through the lens so the intensity of the flash can be set. All work is done by the camera so the flash does not need any metering cells or control circuits.
TTL flash
Through the lens ( TTL ) automatic flash output control uses a light sensor that measures the flash intensity through the lens, as reflected by the subject on the film, ...
E-TTL flash metering issues with digital
Unfortunately, E-TTL was a particular problem for early digital EOS models.
TTL flash metering DURING exposure
Please note that the scene above would probably result in an underexposed image because of the white clothes.
I use the TTL flash system to let the flash control itself for perfect exposure as I vary distance.
Wireless TTL flash - This is now supported with the new EF500 Super/ST DG SA-N flash.
Standard TTL flash : A type of TTL auto flash that does not apply any automatic flash output level compensation.
Ricoh GF-1 TTL Flash for GXr Digital Camera - Guide Number 108
$224.00
Ricoh GXR Interchangeable Unit Body ...
SU-4 wireless TTL flash control
SB-24 Nikon Speedlight
Nikon Products/Speedlights forum
Terms of use ...
i-TTL Flash Control Nikon's i-TTL (intelligent through-the-lens) flash system meters every exposure, setting the Nikon Speedlight's output to the precise level needed to balance the scene's ambient light. Find out more.
Automatic versus TTL flashguns
Most serious photographers use their flashguns in manual mode, so that they have full control over lighting.
"Perfect" Fill Flash: TTL Flash with film wasn't perfect, but it had gotten pretty close. Digital flash has been quite a step back. That's because so far it's tried to recreate fill flash the way film did it.
With TTL flash, exposure is calculated automatically. You may need to make some adjustments, but with medium tone subjects, you should get correct exposure. Bounce heads let you control light to some degree.
S2 or Slave 2: An interesting feature, Slave 2 has been designed to work specifically when you are using at TTL flash to trigger the StarFire™.
One that works with the camera's TTL flash system and exposure compensation is very convenient; one with basic "thyristor" automation can serve the same purpose less conveniently for very little money (for fill-flash, ...
Note: In preparing this web update, I talked to Ike Brigham of Ikelite about current trends in TTL flash. He comments "The Nikonos TTL strobes like SB-105 do operate TTL with the Coolpix 5000 camera in our housing. Same is true for our TTL SubStrobes.
It seems that Nikon has finally standardized on i-TTL flash system since neither body lists support for D-TTL among its features. Most users have probably already upgraded to the SB-800 or SB-600, so this not pose a problem.
A 5 pin O-ring sealed connector used mainly with Ikelite TTL flash units and video lights.
ICS4
An obsolete 4 pin O-ring sealed connector used with early Ikelite automatic flash units.
Designation used by Nikon Corporation to identify a Nikkor lens that supplies distance to subject information to a Nikon AF camera, most useful for ultra-precise TTL and Balanced TTL flash. AF lenses with a D chip.
Refers to both exposure metering of the light passing through the lens (Through-the-lens metering, and TTL flash metering) and viewing a scene through the same lens that allows light to reach the film (Through-the-lens focusing).
R5 and R-E - 1987 - revised electronics (R5 had TTL flash capability), the RE was a simplified model.
R6 - 1988-92 mechanical shutter, relied on battery power only for the built-in light meter.
R6.
You're probably shooting digital and can check exposure on your camera's LCD, so you don't really need TTL exposure control. If the second, non-TTL flash is too bright, manually dial down its power or add some distance between it and your subject.
This is done by using AE L AF-L (Auto Exposure/Autofocus Lock) button or exposure compensation button, or by Auto Exposure Bracketing . In flash photography with a dedicated TTL flashgun exposure compensation can also be performed by varying the ...
"I also carry a cable release and an off-camera TTL flash cord for my Nikon Speedlight," he says. "I'll include a two-stop and three-stop Singh-Ray ND filter and a Gitzo 1228 tripod with a Kirk BH-1 ballhead as well." ...
I would advise that you go for a flash that has TTL flash metering (such as the excellent Olympus system) for macro, as it again removes all need for time consuming exposure calculations if you're using extension equipment.
 See also: TTL, Camera, Flash, Image, Photograph
  
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