Product Description : Clip-on P-TTL auto flash system includes case Guide Number 20 at ISO 100m 28 at ISO 200m Approximately 300 alkaline 400 NiMH or 450 lithium discharges per set of 4 AA-size batteries Discharge angles of 70 horizontally 78 with wide-angle panel 53 vertically 60 with wide-angle panel Uniformly covers the wide discharge angle of a 28mm lens in the 35mm format Compact design
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