Celestron 11007 Betriebsanweisung PDF herunterladen (Seite 20)

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>>ĎėėĔėĚĕĕĔėęđĚęĈčĊĘ



help support and minimize lateral movement of the primary mirror

during astrophotography.

To use the mirror clutches:

͙Ǥ Ǥ

͚Ǥ ǡ

very tight and can be turned no further.

Warning! Once the mirror is locked down, do not turn the focuser

ƤǤ

the focus knob should not damage the telescope, undue stress can

be placed on the focus mechanisms causing excessive image shift

while focusing.

>>ĆđĈĚđĆęĎēČĆČēĎċĎĈĆęĎĔē



ȋȌǤƤǡ

simply divide the focal length of the telescope by the focal length of the

Ǥǡǣ

Let’s say, for example, you are using the 40 mm Plössl eyepiece. To

Ƥ

telescope (the CPC 800, for example, has a focal length of 2032 mm) by

the focal length of the eyepiece, 40 mm. Dividing 2032 by 40 yields a

Ƥ͙͝Ǥ

Although the power is variable, each instrument under average skies

ƤǤ

͘͞Ǥǡ

͘͘͠͠Ǥ͠͘͞

Ƥ͘͜͠Ǥ

Ƥǡ͚͘͛͝

͙͘͞͚͘͠͘͘͠Ǥ

ĆČēĎċĎĈĆęĎĔēȂ

ȋȌ

ȋȌ

>>ĊęĊėĒĎēĎēČĎĊđĉĔċĎĊĜ

Ƥ

Ǥ

ƤǡƤȋ

ȌƤǤǡ

formula looks like this:

ǡƤǡ

ƤǤǡ

Ƥ͘͜Ǥ͘͜

ÚƤ͜͞λǤ͜͞λ

Ƥǡ͙͝ǤƤǤ͡λǡ

almost a full degree.

To convert degrees to feet at 1,000 yards, which is more useful for

terrestrial observing, simply multiply by 52.5. Continuing with our

ǡƤǤ͡λ͚͝Ǥ͝Ǥ

Ƥ͜͟Ǥ

Ƥ

ȋ͗͛͡͞͠͝ȌǤ

ėĚĊĎĊđĉȂ



Ƥ

>>ĊēĊėĆđćĘĊėěĎēČĎēęĘ

When working with any optical instrument, there are a few things to

remember to ensure you get the best possible image.

Ȉ Ǥ

is optically imperfect, and as a result, may vary in thickness from one

Ǥơ

Ǥ

achieve a truly sharp image, while in some cases, you may actually see

a double image.

Ȉ Ǥ

includes asphalt parking lots on hot summer days or building rooftops.

Ȉ ǡƥ

viewing terrestrially. The amount of detail seen under these conditions

is greatly reduced. Also, when photographing under these conditions,

Ƥ

lower contrast and underexposed.

Ȉ ȋƤȌǡ

to remove them when observing with an eyepiece attached to the

telescope. When using a camera, however, you should always wear

Ǥ

stigmatism, corrective lenses must be worn at all times.

͝ǧ͜

Mirror

Clutch

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