Orion StarBlast 6 User Manual page 5

This 6" telescope comes with 2 eyepieces (17mm &
25mm) and a Barlow lens. The lower the number on
the eyepiece the higher the power, the Barlow lens
doubles the power of the eyepiece it is used with.
When viewing it is best to use lower power (higher
mm) eyepieces at first, because they offer a wider
field of view making it easier to find objects.
When viewing deep space objects (star clusters
and nebulae) as well as the moon, it is best to use
lower power. When viewing planets or other small
objects you can try higher power eyepieces to
magnify the image more. However, higher power
also magnifies any vibration or poor 'seeing'
conditions, as well as gathering less light so images
appear dimmer. There is always a tradeoff.
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