Handleiding Celestron CPC Deluxe 800 HD - 11007 (pagina 27 van 50) (Engels)

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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 specic 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 oered 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 is required

which allows for time exposures. This excludes point and shoot cameras

and limits the selection to SLR cameras, the most common type of

35 mm camera on the market today.

Second, the “B” or manual setting should NOT run o 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 nished 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 use a variety of lenses for piggyback photography. If you

can’t nd a new camera, you can purchase a used camera body that is

not 100% functional. The light meter, for example, does not have to be

operational since you will be determining the exposure length manually.

You will also need a cable release with a locking function to hold the

shutter open. Mechanical and air release models are available.

>>

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 specic camera (i.e., Canon, Nikon, etc.).

The T-Ring replaces the 35 mm SLR camera’s normal lens. Prime focus

photography allows you to capture the majority of the lunar or solar disk.

To attach your camera to your telescope:

1. Remove all visual accessories. (For the 9.25” and 11” 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:

1. Center the Moon in the eld of your telescope.

2. Focus the telescope by turning the focus knob until the image is

sharp. Make sure the mirror lock knobs are loosened.

3. Set the shutter speed to the appropriate setting (see Figure 8-1).

4. Trip the shutter using a cable release or self timer.

5. Use your camera’s bracketing feature to automatically change

exposure time in order to nd the best exposure.

The exposure times listed in table 8-1 should be used as a starting

point. Always make exposures that are longer and shorter than the

recommended time. Also, take a few photos at each shutter speed.

This will ensure that you will get a good photo.

• This technique is also used for photographing the Sun with the

proper solar lter.

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

Lunar Phase ISO 50 ISO 100 ISO 200 ISO 400

Crescent 1/2 1/4 1/8 1/15

Quarter 1/15 1/30 1/60 1/125

Full 1/30 1/60 1/125 1/250

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

T-Adapter

T-Ring

(camera

model

specic)





T-Adapter

T-Ring

(camera

model

specic)

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