The falcon eyes transmitter rf-dd2.4-t is a spare transmitter for the rf-dd2.4 radio trigger set. Successor rf-dd4 The rf-dd2.4 is successor to the rf-dd4 and operates on a 2.4ghz frequency, instead of 433mhz. this is therefore not compatible with the old rf-dd4 version, this applies to both the transmitter and the receiver. Attention: the rf-dd2.4 works on all slrs, however with sony / minolta cameras you need the hs-25sa hotsoe adapter. you can use the travor hc-511 adapter for the new sony mi hot shoe. both adapters can be found with the optional accessories. This triggerset is not compatible with: