Bushnell 78-9518 manual Answers To Commonly Asked Questions, Troubleshooting Guide

Models: 78-9518

1 6
Download 6 pages 25.92 Kb
Page 5
Image 5
ANSWERS TO COMMONLY ASKED QUESTIONS

 

ANSWERS TO COMMONLY ASKED QUESTIONS

 

 

 

 

 

 

 

1. The image I see in the telescope is upside down and

∙ An upside-down and reversed image

is a

common

 

reversed from right to left ?

characteristic of all refractor telescopes. Since

 

 

telescopes are used for astronomical viewing

 

 

orientation is not important. An erecting lens can be

 

 

purchased separately

that will allow

you

to see a

 

 

“natural” image. The image in the finderscope will

 

 

also be upside down and reversed.

 

 

 

 

 

 

 

2.

How do I determine the power my telescope ?

∙ The power of your

telescope can be

determine by

 

 

dividing the focal length of the objective lens by the

 

 

focal length of the eyepiece. The eyepiece focal length

 

 

is the number printed on the eyepiece. (For example:

 

 

1000 ÷ 25 = 40X)

 

 

 

 

 

 

3.

Where do I find the Telescope Focal Length

∙ The telescope focal length is the same focal length as

 

 

the objective focal length. For this telescope it is

 

 

900mm. Telescope focal lengths range from 450mm

 

 

to 1000mm on Bausch & Lomb, Bushnell and Jason

 

 

telescopes. Typical

focal lengths

are

600mm,

 

 

700mm, and 900 (Jason); 450, 750 and 910

 

 

(Bushnell); 900, 910 and 1000 for Bausch & Lomb.

 

 

 

4.

What can I see with my telescope ?

∙ Telescopes with power ranging from 25X to 50X can

 

 

be used to view Star Clusters and Nebulae. 90X to

 

 

120X telescope can view galaxies. Most planets can

 

 

be seen at 150X and higher.

 

 

 

 

 

 

5.

What do the numbers on the eyepiece mean ?

∙ The numbers on the

eyepiece represents the “focal

 

 

Length” of the eyepiece.

 

 

 

 

 

 

 

 

TROUBLESHOOTING GUIDE

If after you have set-up your new telescope you are unable to see any objects, use this Quick

Reference guide to help you to understand the cause of the problem and quickly determine a remedy

1.I’ve completed the set-up yet I cannot see anything

Check to see if objective lens cover has been removed.

Try to view an object that is 200 or more yards away.

If there is more than one eyepiece included with the telescope, use the lowest power (highest number) eyepiece to begin viewing.

Use the Rack & Pinion Focusing Mechanism (3) to bring the object you are trying to view into focus

Page 5
Image 5
Bushnell 78-9518 manual Answers To Commonly Asked Questions, Troubleshooting Guide