Skip to Using the Celestron Zoom
The narrow field of view of high power eyepieces makes it difficult to locate
an object. One technique when using a non-guided scope is to use a low
power eyepiece to find and center an object and then switch eyepieces to a high
power eyepiece for detailed observing. Some disadvantages to this
- the hassle of having to switch eyepieces
- moving or bumping the scope during the switch
- dropping or losing eyepieces
Using a zoom eyepiece allows you to locate an object at low power, center the
object, then zoom in at higher magnification.
picture to the right has two circles representing the fields of view
through a Starblast 6i and a Celestron 8-24mm Zoom eyepiece.
circle is at 8mm, its highest magnification (94x).
The outer circle shows the eyepiece at 21mm, its lowest magnification
(31x) and widest field of view (approximately 1 degree).
At low power both the M81 and M82 galaxies can be seen at once (this
is a favorite site)
Note that at high power only one of galaxies can be seen at once.
Using the Celestron 8-24 Zoom
The Celestron Zoom installs like any other eyepiece and should be secured by
tightening the thumbscrews on the finder.
Zoom has an arrow and a focal length scale for easy reference.
To zoom in (higher power), grab the eyepiece by the knurled section
and twist to the left (counterclockwise). 8mm is the highest
To zoom out (lower power, wider field of view), grab the eyepiece by
the knurled section and twist to the right (clockwise). 24mm is
the lowest magnification and the widest field of view.