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6

proper tension – not too tight and not too loose — you should 

be able to move the instrument without having to adjust the ten-

sion knobs each time. The friction will be sufficient to allow the 

instrument to move but also to stay put when you let go of it 

to observe. To make finer directional adjustments to the instru-

ment, turn the hand knobs on the micro-motion cables. 
The azimuth axis is rotatable 360 degrees and the altitude axis 

has 180 degrees of motion. 

Tripod Height Adjustment

There is a leg extension segment on each tripod leg to allow 

quick height adjustment. Simply loosen the winged leg lock 

knobs half a turn or so, extend the leg to the desired length, 

then retighten the winged knobs. 

Tripod Feet

Note that at the bottom of each tripod leg is a rubber foot. If 

desired, the foot can be retracted by rotating it clockwise to 

expose a metal spike, when needed for extra grip on slippery 

surfaces. If the spikes are not needed, rotate the rubber foot 

counterclockwise until the spike is recessed in the foot and no 

longer protruding. 

Accessory Tray

The triangular accessory tray acts as a tripod leg brace as well 

as a storage rack for 1.25

"

 telescope eyepieces or accessories. 

The four holes in the tray accommodate the barrels of 1.25

"

 

accessories. 

3. Astronomical Observing 

For many, this will be your first foray into the exciting world of 

amateur astronomy. The following information and observing 

tips will help get you started. 

Choosing an Observing Site 

When selecting a location for observing, get as far away as 

possible from direct artificial light such as street lights, porch 

lights, and automobile headlights. The glare from these lights 

will greatly impair your dark-adapted night vision. Set up on 

a grass or dirt surface, not asphalt, because asphalt radiates 

more heat. Heat disturbs the surrounding air and degrades the 

images seen through the telescope. Avoid viewing over roof-

tops and chimneys, as they often have warm air currents rising 

from them. Similarly, avoid observing from indoors through an 

open (or closed) window, because the temperature difference 

between the indoor and outdoor air will cause image blurring 

and distortion. 
If at all possible, escape the light-polluted city sky and head for 

darker country skies. You’ll be amazed at how many more stars 

and deep-sky objects are visible in a dark sky! 

“Seeing” and Transparency 

Atmospheric conditions vary significantly from night to night. 

“Seeing” refers to the steadiness of the Earth’s atmosphere at 

a given time. In conditions of poor seeing, atmospheric turbu-

lence causes objects viewed through the telescope to “boil.” If 

you look up at the sky and stars are twinkling noticeably, the 

seeing is poor and you will be limited to viewing at lower magni-

fications. At higher magnifications, images will not focus clearly. 

Fine details on the planets and Moon will likely not be visible. 
In conditions of good seeing, star twinkling is minimal and imag-

es appear steady in the eyepiece. Seeing is best overhead, 

worst at the horizon. Also, seeing generally gets better after 

midnight, when much of the heat absorbed by the Earth during 

the day has radiated off into space. 
Especially important for observing faint objects is good “trans-

parency”—air free of moisture, smoke, and dust. All tend to scat-

ter light, which reduces an object’s brightness. Transparency is 

judged by the magnitude of the faintest stars you can see with 

the unaided eye (5th or 6th magnitude is desirable). 

Cooling the Telescope 

All optical instruments need time to reach “thermal equilibri-

um.” The bigger the instrument and the larger the temperature 

change, the more time is needed. Allow at least 30 minutes for 

your telescope to acclimate to the temperature outdoors before 

you start observing with it. 

Let Your Eyes Dark-Adapt 

Don’t expect to go from a lighted house into the darkness of the 

outdoors at night and immediately see faint nebulas, galaxies, 

and star clusters—or even very many stars, for that matter. Your 

eyes take about 30 minutes to reach perhaps 80% of their full 

dark-adapted sensitivity. As your eyes become dark-adapted, 

more stars will glimmer into view and you’ll be able to see faint-

er details in objects you view in your telescope. 
To see what you’re doing in the darkness, use a red-filtered 

flashlight rather than a white light. Red light does not spoil your 

eyes’ dark adaptation like white light does. A flashlight with a red 

LED light is ideal. Beware, too, that nearby porch, streetlights, 

and car headlights will ruin your night vision. 

Eyepiece Selection 

Magnification, or power, is determined by the focal length of 

the telescope and the focal length of the eyepiece being used. 

Therefore, by using eyepieces of different focal lengths, the 

resultant magnification can be varied. It is quite common for 

an observer to own five or more eyepieces to access a wide 

range of magnifications. This allows the observer to choose 

the best eyepiece to use depending on the object being viewed 

and viewing conditions. Your VersaGo E-Series 90mm refractor 

comes with 25mm and 10mm eyepieces, which will suffice nice-

ly to begin with. You can purchase additional eyepieces later if 

you wish to have more magnification options. 
Magnification is calculated as follows: 

For example, the VersaGo E-Series 90mm has a focal 

length of 600mm, which when used with the supplied 25mm 

eyepiece yields: 

=  24x 

600 mm

25 mm

Содержание 52590

Страница 1: ...Hangar Way Watsonville CA 95076 USA Providing Exceptional Consumer Optical Products Since 1975 Copyright 2018 Orion Telescopes Binoculars All Rights Reserved No part of this product instruction or any...

Страница 2: ...st cap K MoonMap 260 not shown in Fig 1 WARNING NEVER look directly at the Sun through your telescope even for an instant without a professionally made solar filter that completely covers the front of...

Страница 3: ...ew to secure the cable in place The thumbscrew should protrude down into the dimple in the axle to insure that the cable will not slip off the axle Once attached the micro motion cables should appear...

Страница 4: ...cro motion cable Azimuth micro motion cable Azimuth tension knob Altitude tension knob Finder scope base Figure 6 A The dovetail saddle B Slide the dovetail bar on the optical tube into the saddle of...

Страница 5: ...ct should appear in the field of view somewhere near the red dot NOTE This finder has two brightness settings When the switch is set all the way over to the ON position the red dot is brightest But in...

Страница 6: ...h the telescope to boil If you look up at the sky and stars are twinkling noticeably the seeing is poor and you will be limited to viewing at lower magni fications At higher magnifications images will...

Страница 7: ...such as star clusters and nebulas Do not expect to see colors in faint objects as you do in photographs however Most galaxies and nebulas will appear gray in color Unlike a camera which can record col...

Страница 8: ...our refractor telescope requires very little mechanical main tenance The optical tube has a smooth painted finish that is fairly scratch resistant If a scratch does appear on the tube it will not harm...

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Страница 10: ...10 This page left blank intentionally...

Страница 11: ...11 This page left blank intentionally...

Страница 12: ...instrument has been abused mishandled or modified nor does it apply to normal wear and tear This warranty gives you specific legal rights It is not intended to remove or restrict your other legal righ...

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