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StarSense is aligned, but there’s just one fi rst-time-only
step before you’re ready to go: Calibrate the camera to
the telescope.
3. After the StarSense alignment is complete, select a bright
star in SkyPortal by tapping it on the screen, then tap “GoTo”.
If the star is not in the eyepiece’s fi eld of view, start by
centering it in the StarPointer, then center it in the eyepiece.
With the star centered in the eyepiece, tap Align, then tap
Calibrate. Once the camera is calibrated, follow the prompts
to start a new StarSense Auto alignment. You only need to
do this the fi rst time you are using
StarSense with the telescope in SkyPortal.
Congratulations! You are now aligned and
ready to observe.
Tap objects on your screen and select GoTo or search for a
specifi c object in the search fi eld. To start, you can choose from
the “Tonight’s Best” list in SkyPortal under the Search menu.
Important Information About Your 8”
EdgeHD Optical Tube Assembly
Your EdgeHD optical tube is optimized for both visual
astronomy and astrophotography, delivering images free of
coma or fi eld curvature across a large image circle. Start by
using the supplied Star Diagonal and eyepieces to familiarize
yourself with the telescope.
Primary Mirror Clutch Knobs
(for Astrophotography Only)
The primary clutch knobs hold the mirror in place to prevent
movement during a long exposure astroimage. Keep these
loosened unless you are using a camera for long exposures.
When using a camera, focus the telescope fi rst, then tighten the
knobs.
Warning: Do not turn the focus knob with the clutch
knobs tightened. Anytime you refocus the telescope,
loosen the clutch knobs.
Optimum Camera Distance
The 8” EdgeHD was designed to work with your camera at a
specifi c distance from the end of the threads on the back of the
scope to the camera’s sensor.
Remove Visual Back
Camera
Focal Plane
Adapter Plate
5.24”(133 mm)
Edge HD 8”- Optimum Back Focus Distance
If you are using a DSLR, the distance is already set correctly
when you use these standard adapters available from Celestron:
• T-ring for the make and model of your camera
• T-adapter for 8” EdgeHD
If you are using an astronomical CCD camera, you must
determine the necessary adapter length to the camera body.
The total distance from the end of the adapter plate
threads to the camera sensor should be 133mm.
This is the total required backfocus distance. Your camera
body to the imaging sensor will take up some of this backfocus
distance. Your camera manufacturer will usually specify
the camera backfocus distance. For example, if your
camera’s backfocus distance is 55mm, then you will need 78mm
of spacing to reach 133mm.
Fastar Compatibility and Imaging at f/2
Corrector
Plate
Secondary
Mirror Mount
Handle
Secondary
Mirror
Secondary
Mirror
Retaining Ring
Your 8” EdgeHD is equipped with a removable secondary mirror
that allows you to convert your f/10 telescope into an f/2 imaging
system using an optional lens accessory. This adds versatility to
use the telescope at different focal ratios for astrophotography.
Imaging at f/2 is favored for wide-angle deep sky imaging with
short exposures, well suited to large, deep sky objects.
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.
