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...and of course Canon weren't going to let Olympus get away with the laurels and bought out the 300TL
[2] A-TTL Mode
This mode is advantageous for general flash photography. Operation is fully automatic, under conditions ranging from total darkness to fill-in flash.
The shutter speed and the aperture are set automatically with the aid of near-infrared rays, etc., and the flash output is controlled by directly measuring the light coming through the lens and being reflected from the film surface. In cases such as fill-in flash, this A (Advanced)-TTL mode balances the exposure between the main subject and the background to prevent unnatural effects.
The light is measured through the lens so exposure is automatically compensated even in bounce flash photography and multiple flash photography.
[3] FEL (Flash Exposure Lock) Mode
With the world's first spot metering for flash photography, using the principle of spot metering, this mode gives correct exposure even when the main subject is not in the center of the viewfinder.
Before an exposure is made, the pre-flash is made by a 1/20th power. The light reflected from the main subject is spot-metered by the camera and the exposure level is stored into memory (effective for 30 seconds). When the actual exposure is made, the flash output is determined by this value. TTL flash photography is possible without being affected by the reflectivity of the film in use since the TTL control system of this mode does not use the reflection from the film surface.
It is also possible to independently control the exposure level for the main subject with the flash and the exposure level for the background with the ambient light, if the H/S control of the T90 is used with the FE lock mode.
[2] A-TTL Mode
This mode is advantageous for general flash photography. Operation is fully automatic, under conditions ranging from total darkness to fill-in flash.
The shutter speed and the aperture are set automatically with the aid of near-infrared rays, etc., and the flash output is controlled by directly measuring the light coming through the lens and being reflected from the film surface. In cases such as fill-in flash, this A (Advanced)-TTL mode balances the exposure between the main subject and the background to prevent unnatural effects.
The light is measured through the lens so exposure is automatically compensated even in bounce flash photography and multiple flash photography.
[3] FEL (Flash Exposure Lock) Mode
With the world's first spot metering for flash photography, using the principle of spot metering, this mode gives correct exposure even when the main subject is not in the center of the viewfinder.
Before an exposure is made, the pre-flash is made by a 1/20th power. The light reflected from the main subject is spot-metered by the camera and the exposure level is stored into memory (effective for 30 seconds). When the actual exposure is made, the flash output is determined by this value. TTL flash photography is possible without being affected by the reflectivity of the film in use since the TTL control system of this mode does not use the reflection from the film surface.
It is also possible to independently control the exposure level for the main subject with the flash and the exposure level for the background with the ambient light, if the H/S control of the T90 is used with the FE lock mode.