Question by James B: is there any difference in in accuracy between ttl and auto mode, for a flash?
Is ttl basically the same thing as auto except that ttl tells the flash what yur camera settings are and in auto u have to manually dial in the settings? Also, there is something called i-tt(for nikon) and a a comparable function for other camera manufacturers where teh camera shoots a quick preflash to determine exposure. What is, if any, the advantage to i-tt. Is it any more accurate than auto or ttl?
Best answer:
Answer by G
iTTL for Nikon is the auto mode. In iTTL mode, lens information is passed to the flash in order to compensate for distance, aperture, shutter speed, and focal length.
On Canon, it is call eTTL and performs the same function as iTTL for Nikon.
In Auto mode, the flash (strobe) just measures the reflectivity of the subject and computes an educated guess as to distance, etc.
Using iTTL or eTTL mode will normally provide better results, less glare, and if done right less red-eye.
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