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佳能５５０ＥＸ型闪光灯 佳能５５０ＥＸ型闪光灯（图１）是一款佳能ＥＯＳ系列相机专用的高能量闪光灯，通常与佳能ＥＯＳ－１Ｖ型、ＥＯＳ－３型、ＥＯＳ Ｄ３０或ＥＯＳ Ｄ２０００型高级单镜头反光照相机配合使用。 该款闪光灯采用了佳能特有的Ｅ－ＴＴＬ评价测光自动闪光
Canon 550EX Speedlight The Canon 550EX Speedlight (Figure 1) is a high-energy flash specifically for the Canon EOS family of cameras and is typically used in conjunction with the Canon EOS-1V, EOS-3, EOS D30 or EOS D2000 advanced single-lens reflex cameras use. This flash uses Canon’s unique E-TTL evaluation metering auto flash