Vivitar VIV-TEL-76700 - Manual (Page 10)

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The telescope is a precision optical instrument . The more you know about it, and the more
carefully you maintain it, the many service it will provide for you.
What you see through the telescope and whether you see clearly is dependant on three
factors: magnification , brightness and resolving power. There is a common misconception
that it would be better if the magnification is bigger at all times .While one of the most
important functions of the telescope is to magnify, you must keep in mind that the effective
magnification is after all limited . For example if the magnificafion gets too big it will make
the image dim and the field of view narrow . So it is necessary to consider about the three
factors altogether.
Tips on Using Your Telescope