The TTL BaLanced fill (TTL BL) mode is the most complicated flash mode on the Nikon Speedlights. This mode is (so far) not found on any third party flash units.
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尼康高速闪光灯有两种不同的TTL模式：普通ttl模式和TTL均衡补充(TTL BL)模式。
Nikon Speedlights let the photographer choose between two different TTL modes: a plain TTL mode, and the TTL BaLanced fill (TTL BL) mode.
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