![]() Even if your primary goal is to shoot close ups of deep-sky objects through your telescope, shooting simple camera-on-tripod shots will help familiarize you with the functions of your camera that you’ll use for all types of deep-sky DSLR astrophotography. You’ll also want a tripod for your first foray into DSLR astrophotography. Make sure you select the proper model for your particular camera. Versatile, inexpensive cable release intervalometers are made by Phottix ( and other accessory makers, and are easy to find on or. It allows you to program a series of long exposures and eliminates the need for a delay between images. For longer exposures, you can use a special cable release with a built-in intervalometer. You can make single exposures up to 30 seconds by pressing the shutter release on the camera, and setting a delay so the vibration from pressing the button will have died away before the shutter opens. The first is a device that will let you shoot long exposures without touching the camera. Once you’ve picked your camera, there are a few additional accessories you’ll need to start shooting the night sky. If you don’t have Live View, you’ll need some form of focusing aid, or you can confirm focus by taking short 5-second exposures and immediately viewing them on the rear screen. This makes focusing your lens or telescope a breeze compared to other methods. If you’re shopping for a new DSLR with astrophotography in mind, one particular feature worth seeking out is known as “Live View.” This feature allows you to turn on the sensor and view a live video on the camera’s rear LCD screen. Right: When the stock filter is replaced with a custom filter, the resulting image of Orion’s Belt reveals much more nebulosity. ![]() Left: Unfortunately, these stock filters block much of the reddish nebulosity in the Milky Way, as seen in this image of Orion’s Belt. Most DSLR cameras have filters that block the far-red end of the spectrum to produce natural-color daylight images. ![]() This model has long since been discontinued, but Canon has incorporated many of its best features useful for astrophotography into current models. It is the only DSLR maker that has actively cultivated the astronomy market, at one time even marketing a DSLR specifically for astrophotographers (the 20Da). There are many DSLR cameras available for purchase, but Canon manufactures the most popular ones for astrophotography. And DSLRs don’t require you to bring along a computer when you’re shooting the night sky. In 10 minutes with a modest telephoto lens, you can record 16th-magnitude stars. (Well, hardly ever.) A 2-minute exposure is long enough to capture a respectable image of the Orion Nebula. Unlike film, the CMOS sensor in a DSLR has no reciprocity failure it never forgets a photon. The common APS-C size CMOS sensors in many consumer DSLRs are about 65% as big as 35-mm film, and about as large as many mid-range astronomical CCD cameras. Most of the cameras are designed to use the same lenses as their 35-mm film precursors, and they have relatively large sensors compared to their point-and-shoot counterparts. Several factors make DSLRs good for astronomy. Covington explains how you can use your DSLR for astrophotography and capture spectacular images like the one above of the Pipe Nebula in Sagittarius. Today’s camera models have much lower noise than in the past and more features useful to amateurs. Astrophotography with digital single-lens reflex (DSLR) cameras spans all facets of amateur astrophotography.
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