intervalometer

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intervalometer

(ˌɪntəvəˈlɒmɪtə)
n
(Photography) an automatic device used to trigger an operation at regular intervals, esp such a device operating the shutter of a camera
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Setting the interval can be confusing, as some intervalometers (notably Canon's TC-80N3) define "interval" to mean the time from when the shutter closes to when it opens again.
Most camera manufacturers sell digital intervalometers (such as Canon's TC 80N3 or Nikon's MC-3G), which are excellent but a little pricy.
Photographs were taken over 24-h periods with Nikon Coolpix 5700 digital cameras (Nikon Corporation, Tokyo, Japan) and DigiSnap 2000 intervalometers (Harbortronics, Gig Harbor, WA, USA) set to record an image every 15 min.
Most camera manufacturers sell digital intervalometers (such as Canon's TC 80N3 or Nikon's MC-36), which are excellent but a little pricy.
A few nights of practice will familiarize you with your camera's features that are beneficial for astrophotography, such as mirror lock-up, noise reduction, and programming sequences of exposures on your intervalometer.
One accessory besides a tripod that's essential to shooting most nightscapes is an intervalometer. This is a programmable gadget that will fire your camera's shutter automatically for as many images as you like, as long as you want, and spaced at the time interval you desire.