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With the Speedlite 550EX and the Speedlite Transmitter ST-E2, it is now possible to use multiple Speedlites under full E-TTL control and without the need for any interconnecting wires. Developed in conjunction with the Speedlite 550EX and the EOS-3 camera, this master control device for a wireless Speedlite flash system meets professional and advanced amateur standards. Its dedicated transmitter controls up to 3 Canon 550EX Speedlites as slave units 33 feet away outdoors and 49.5 feet away indoors. It is mounted as a clip-on with a shoe lock lever and locking pin.
Macrolite adapters are rings used to attach macrolites to select lenses.
The Canon Macrolite Adapter 67 attaches MT-24EX, MR-14EX or ML-3 to most 67mm filter size lenses.
Not recommended for use with the EF-28-80mm f/3.5-5.6, EF 28-70mm f/3.5-4.5, EF 35-70mm F/3.5-4.5, or FD 28-55mm f/3.5-4.5, or FD 35-70mm f/3.5-4.5; already built into the EF 50 f/2.8 Marco, EF 100mm f/2.8, EF-S 60mm f/2.8 USM Marco, EF 100mm f/2.8 USM Marco and MP-E 65mm lenses.