Celestron NexStar EVOLUTION 8 EDGE HD Guía De Instalación Rápida página 11

Optional Focal Reducer
A dedicated 0 .7x Focal Reducer for the 8" EdgeHD is
available from Celestron . This focal reducer maintains the
flat-field and coma-free imaging performance specifically
designed for this telescope .
Collimation
Your telescope is factory aligned and generally should not
need collimation unless it is transported roughly . However,
you should be aware of the eventual need to collimate your
telescope to keep it operating at peak performance .
1 . Using your included 13mm eyepiece (or a higher power
eyepiece if you have one), point the telescope at a
moderately bright star center it in the eyepiece .
2 . Defocus the star about 1 turn on the focus knob .
3 . Inspect the star pattern . When collimated, the pattern
should look like a concentric doughnut . If the pattern is
concentric, no adjustment is necessary .
4 . Adjust the telescope collimation if needed by slightly
adjusting the 3 Phillips head screws in front of the
secondary mirror .
5 . If the star pattern is thin on one side, adjust the collimation
so that the star moves towards the thin side, then adjust
the position of the telescope to re-center the star . Repeat
this until you achieve correct collimation .
Secondary Mirror Collimation Adjustment Screws
A defocused star where the
secondary shadow is not
concentric to the star pattern
indicates the telescope
requires collimation.
The telescope is collimated
if the defocused star pattern
is concentric as shown.
ENGLISH
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