And via remote the bulb mode on Sonys acts as if it were a T mode: first remote signal opens the shutter, second (say 50 sec later) remote signal closes it. Maybe timed remote release beyond 30 sec is possible via cell phone apps.
The remote shutter control includes a battery and was easy to connect with Bluetooth. Flip the on/off switch on the side, go to the Bluetooth settings on your phone and it's there to connect. Once connected, launch the iPhone camera app, press the big shutter button on the remote, and it snaps a picture instantly. There is also a smaller button
An untethered remote shutter release operates wirelessly. The simplest use infrared (IR) and rely on the camera’s inbuilt IR receiver. The more advanced come in two parts – a transmitter and a receiver. They communicate with each other using radio signals. The receiver attaches to the camera.
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what is a bluetooth remote shutter