Title: It does what it's supposed to do...
Product review: The one big advantage of this unit is that it's the only way to coax the camera into taking exposures longer than 30 seconds. It is also, of course, useful in any circumstance when you'd use a cable release on a traditional camera.The one odd thing about it... If you've set the camera for say a 5 second exposure, and release the button before 5 seconds passes - it'll stop the exposure when you release the button. There is a sliding lock that will hold down the button for you, so you're not stuck wearing out your thumb during an astrophotography session.
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