LPA remote radio trigger & receiver
Nikon SD-8a battery packs for 2 flashes when using dual flash. Alternatively I have a Digital Camera Battery, but the SD-8a is a cheaper and lighter solution if all you need is flash support.
DPP Solutions: Radio Triggers
On-camera flash will only go so far
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Some sensors are more sensitive than others, or more sensitive to sunlight, some permit 'coded' signals to reduce cross-firing in multiple-lighting setups, and others come with integral radio triggering capabilities.
If you're looking for a trigger system, the same company also makes a radio trigger with an incredible range, the Yongnuo RF-603 radio trigger system. I don't work for them, but I highly recommend their products.
One thing that Canon users will have to keep in mind is that once you start using radio triggers (excluding RadioPoppers and Pocket Wizards latest models) or other non-eTTL methods, you lose option for 2nd (rear) curtain flash sync.
Sixth, wireless E-TTL is not compatible with the vast majority of other wireless systems, such as most third party radio triggers. You thus can't mix and match most wireless systems.
add significantly to the image and optical slaves such as the Adorama Electronic Slave Unit to trigger the other lights. In the case of the Sony NEX-7, you will need the Sony Hotshoe Adapter to use this or most any radio trigger.
 See also: Time, Trigger, Camera, Photograph, Flash
  
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