Bushnell Model 78-9570 manual Answers To Commonly Asked Questions, Troubleshooting Guide

	ANSWERS TO COMMONLY ASKED QUESTIONS
1.	The image I see in the telescope is upside down	∙ An upside-down and reversed image is a
	and reversed from right to left?	common characteristic of most astronomical
		telescopes. Since telescopes are used for
		astronomical viewing orientation is not important.
		However, as described above, the T-18 erecting
		lens can be used to provide normal images.
2.	How do I determine the power my telescope?	∙ The power of your telescope can be determined
		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 910mm. Telescope focal lengths
		range from 600mm to 910mm on Bushnell
		telescopes.
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 telescopes 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