Manual Celestron CGE Pro 925 (page 45 of 72) (English)

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1. Load your camera with film that has a moderate-to-fast speed (i.e., ISO rating). Faster films are more desirable when the

Moon is a crescent. When the Moon is near full, and at its brightest, slower films are more desirable. Here are some

film recommendations:

 T-Max 100

 T-Max 400

 Any 100 to 400 ISO color slide film

 Fuji Super HG 400

 Ektar 25 or 100

2. Center the Moon in the field of your telescope.

3. Focus the telescope by turning the focus knob until the image is sharp.

4. Set the shutter speed to the appropriate setting (see table below).

5. Trip the shutter using a cable release.

6. Advance the film and repeat the process.

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

The exposure times listed in table 7-1 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.

 If using black and white film, try a yellow filter to reduce the light intensity and to increase contrast.

 Keep accurate records of your exposures. This information is useful if you want to repeat your results or if you

want to submit some of your photos to various astronomy magazines for possible publication!

 This technique is also used for photographing the Sun with the proper solar filter.

Eyepiece Projection

This form of celestial photography is designed for objects with small angular sizes, primarily the

Moon and planets. Planets, although physically quite large, appear small in angular size because

of their great distances. Moderate to high magnification is, therefore, required to make the

image large enough to see any detail. Unfortunately, the camera/telescope combination alone

does not provide enough magnification to produce a usable image size on film. In order to get

the image large enough, you must attach your camera to the telescope with the eyepiece in

place. To do so, you need two additional accessories; a deluxe tele-extender (#93643), which

attaches to the visual back, and a T-ring for your particular camera make (i.e., Minolta, Nikon,

Pentax, etc.).

Table 7-1

Above is a listing of recommended exposure times when photographing the Moon at the

prime focus of your telescope.

Figure 7-1 - Accessories for

Projection Photography

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Celestron CGE Pro 925 Manual

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