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| p.1 #3 · dedicated wireless flash transmitter or hot shoe with PC cord? |
...I want to go down the 2nd option route but the hot shoe only has 2 contacts, on the Canon flash and camera there is also an aditional 4x pin contacts behind the main circular contact and I need to know what they are for and if I should need them, can anyone send me some advice please?
The two contacts are for a simple sync command; they tell a flash only when to fire. The extra contacts are for ETTL autoflash communication with Canon -- and Canon-compatible, 3rd party -- flashes.
If you know how to meter a flash and can make use of manual mode, a PC-only cable or inexpensive radio triggers are all you need.
If you want through-the-lens remote flash metering, remote High Speed Sync, or other advanced options you need an ETTL cable, an ST-E2 (or a Master-capable Speedlite), or more-expensive radio links. I use both a Master flash and a long ETTL cable (not at the same time) depending on the situation.
Here's a link to the cable I use: