Celestron 102mm Gebruiksaanwijzing - Pagina 12

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Observing Deep Sky Objects

Deep sky objects are simply those objects outside the boundaries of our solar system. They

include star clusters, planetary nebulae, diffuse nebulae, double stars, and other galaxies outside

our own Milky Way. Because your spotting scope is not set up for serious astronomical

observing, you will need to know where to look in the sky for these objects. The Celestron Sky

Maps (#93722) will help you locate the brightest deep sky objects.

Once you start observing deep sky objects, there are a few things to remember. First, most deep

sky objects have a large angular size. Therefore, low to moderate power is all you need to see

them. Second, visually they are too faint to reveal any color that is common to photographs.

Instead, they have a black and white appearance. And lastly, because of their low surface

brightness, they should be observed from a dark sky location. Light pollution around large urban

areas washes out most nebulae making them difficult, if not impossible, to see. An LPR (Light

Pollution Reduction) Filter (#94126A) is available for use with 1 1 /4" eyepieces to allow urban

use of the 102mm Wide View for looking at nebulae.

Photographing the Moon

After looking at the night sky for awhile you may want to try photographing it. If you do, start

with a nice, bright object like the Moon. To photograph the Moon:

1. Attach your spotting scope to a stable platform like the Celestron Photographic Tripod

(#93596).

2. Load your camera with film that has a moderate-to-fast speed (i.e., high ISO rating). Faster

films are more desirable when the Moon

brightest, slower films are more desirable. If photographing during the full phase, use a

yellow filter to reduce the light intensity and to increase contrast.

3. Center the Moon in the field of your spotting scope.

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

Trip the shutter using a cable release so as not to shake the camera and spotting scope

Lunar Phase

ISO 50 ISO

Crescent

1/8

Quarter

1/30

Full

1/125

The exposure times listed here should be used as a starting point. Always make exposures that are

longer and shorter than the recommended time. Also, try bracketing your exposures, taking a few

photos at each shutter speed. This will ensure that you will get a good photo. Keep accurate

records of your exposures. This information will be useful if you want to repeat your results or if

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

is a crescent. When the Moon is full, and at its

ISO

ISO 400

100

200

1/15

1/60

1/125

1/250

1/500

1/1000

1/2000