Focusing; Image Orientation - Orion StarSeeker IV GoTo Instruction Manual

The magnification provided by the 10mm eyepiece is:
Although the power can be varied, each instrument under aver-
age skies has a limit to the highest useful magnification that can
be achieved. The general rule is 2x per millimeter of aperture
is as high as you can reasonably go (with optional eyepiece
and possibly a Barlow lens). For example, the StarSeeker IV
114mm reflector has a primary mirror that's 114mm in diameter.
So 114mm times 2x per millimeter = 114 x 2 = 228. Thus, 228x
is the highest useful magnification one can normally achieve
under ideal seeing conditions with this telescope. (Trying to go
higher would likely just result in dim, blurry images.) Although
this is the maximum useful magnification, most observing will
yield best results at lower powers.

Focusing

To focus, if you have a StarSeeker IV Newtonian reflector tele-
scope, simply turn either of the two focus wheels on the focuser
until the image looks sharp. For the Maksutov-Cassegrain mod-
els, the focus knob resides to the right of the visual back, or
accessory adapter. Make sure you're aimed at something far
off in the distance. If you don't see an image at first, keep turn-
ing the focus knob in one direction while looking through the
eyepiece; if you reach the end of the focuser travel start turning
the focus knob in the other direction. Eventually, you should see
the object you're aimed at come into view. After going just past
the focus point in one direction, and then in the other direction,
you will then be able to home in on the exact focus point using
progressively smaller turns of the focus knobs.
Tab
LED
ON/OFF
knob
Altitude
adjusment
knob
Thumbscrews
Figure 12.
Familiarize yourself with the parts of the EZ Finder II.
8
500mm
= 22x
23mm
500mm
= 50x
10mm
Sight tube
Battery
compartment
cover
Azimuth
adjustment
knob
Figure 11.
The EZ Finder II superimposes a tiny red dot on the sky,
showing right where the telescope is aimed.

Image Orientation

For astronomical telescopes, the image orientation in the eye-
piece will usually be different from the orientation you would
see with the naked eye. Refractor and Maksutov-Cassegrain
telescopes used with a standard 90-degree "star diagonal" will
provide a right-side-up but backwards (mirror-reversed) image.
For reflector telescopes the image in the eyepiece will appear
upside down or rotated to some degree. This is normal! For
astronomical viewing image orientation is not critical because,
after all, there's no "right side up" in space. But if you're planning
to use your telescope also for terrestrial viewing, you may want
to purchase a "correct-image" diagonal, which will produce a
correctly oriented, right-side-up view. Reflector telescopes are
not recommended for terrestrial viewing.
Bracket
Figure 13.
StarSeeker IV telescopes come with 23mm and 10mm
wide-field eyepieces.
Red dot