algan nustekin |
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description
hi there could any one please tell me what is ttl and non-ttl are these words only used for flash equipments or what?
why it is called 35mm photograph I measured all size of the negative but could not understand which side is 35mm last, what is white balance for digital cameras and what is used for? thanks
February 25, 2003
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Jon Close |
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TTL = Through The Lens flash metering. The camera has a light sensor/meter that measures the light striking the film while the shutter is open and sends a signal to the flash to shut down the its output when sufficient exposure is attained. Non-TTL flash are either fully manual, or have automatic exposure controled by a light sensor mounted on the flash itself. 35mm is the width of the film, outside edge to outside edge. The actual image size between the sprocket holes is 24mm tall x 36mm wide. White balance adjusts the digital sensors so that white is white with different light sources (sunlight v. tungsten v. fluorescent v. halogen v. mercury vapor v. ...)
February 25, 2003
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John A. Lind |
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TTL isn't limited to only flash control. Camera bodies that can control a dedicated flash (one made specifically for that camera) using TTL metering also use the same metering system for setting exposure without flash, allowing you to do it manually, or doing it automatically for you. -- John
February 25, 2003
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