Bedienungsanleitung Celestron EdgeHD 9.25 (Seite 9 von 21) (Englisch)

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After looking at the night sky for a while you may want to try photographing it. Several forms of celestial

photography are possible with your telescope, including short exposure prime focus, eyepiece projection, long

exposure deep sky, terrestrial and even CCD imaging. Each of these is discussed in moderate detail with enough

information to get you started. Topics include the accessories required and some simple techniques. More

information is available in some of the publications listed at the end of this manual.

In addition to the specific accessories required for each type of celestial photography, there is the need for a

camera - but not just any camera. The camera does not have to have many of the features offered on today's

state-of-the-art equipment. For example, you don't need auto focus capability or mirror lock up. Here are the

mandatory features a camera needs for celestial photography. First, a “B” setting which allows for time

exposures. This excludes point and shoot cameras and limits the selection to SLR cameras, the most common

type of 35mm camera on the market today.

Second, the “B” or manual setting should NOT run off the battery. Many new electronic cameras use the battery

to keep the shutter open during time exposures. Once the batteries are drained, usually after a few minutes, the

shutter closes, whether you were finished with the exposure or not. Look for a camera that has a manual shutter

when operating in the time exposure mode. Olympus, Nikon, Minolta, Pentax, Canon and others have made

such camera bodies.

The camera must have interchangeable lenses so you can attach it to the telescope and so you can use a variety of

lenses for piggyback photography. If you can't find a new camera, you can purchase a used camera body that is

not 100-percent functional. The light meter, for example, does not have to be operational since you will be

determining the exposure length manually.

You also need a cable release with a locking function to hold the shutter open while you do other things.

Mechanical and air release models are available.

Short Exposure Prime Focus Photography

Short exposure prime focus photography is the best way to begin recording celestial objects. It is done with the

camera attached to the telescope without an eyepiece or camera lens in place. To attach your camera you need

the Celestron T-Adapter (See Optional Accessories section) and a T-Ring for your specific camera (i.e., Canon,

Nikon, etc.). The T-Ring replaces the 35mm SLR camera's normal lens. Prime focus photography allows you to

capture the majority of the lunar disk or solar disk. To attach your camera to your telescope.

1. Remove all visual accessories. (For the 11" and

14" tube you must also remove the 3" adapter

plate threaded onto the rear of the tube)

2. Thread the T-Ring onto the T-Adapter.

3. Mount your camera body onto the T-Ring the

same as you would for a standard camera lens.

4. Thread the T-Adapter onto the back of the

telescope while holding the camera in the

desired orientation (either vertical or horizontal).

With your camera attached to the telescope, you are

ready for prime focus photography. Start with an

easy object like the Moon. Here's how to do it:

Figure 3-1 – T-Adapter for 8" Optical Tube

T-Adapter

T-Ring (Camera

Model Specific)

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