Filter
Top Products
1. Basic Description: In addition to our revolutionary Penta Mirror Technology, Bushnell is proud to
present yet another pioneering feature with this telescope--Bushnell’s ZOOM Eyepiece Assembly.
This assembly will provide the benefit of instantaneously zooming from 50 power to 150 power with a
twist of the power change ring. Little if any refocusing will be required. This feature gives your
telescope an infinite number of magnification levels from 50x to 150x. Not only is this a convenient
new feature to the astronomical community but it also provides an erect (or “right-side-up”) image. As
a result, astronomers, birdwatchers, nature enthusiasts and many others can enjoy the convenient
and intuitive images seen through this telescope.
2. How-To-Use: Place the ZOOM Eyepiece Assembly directly into the rear of the Penta Mirror
Assembly with grooved insert, then place the Penta Mirror directly into the back of the telescope
focusing tube. (See Intended Configuration Diagram). CAUTION: DO NOT USE THE ZOOM
EYEPIECE WITH THE ERECTING LENS OR BARLOW IN ANY POSSIBLE CONFIGURATION
Selecting an Eyepiece:
1. You should always start viewing with the lowest power eyepiece, which in this case is the 15 mm
lens. Note: the base power of each eyepiece is determined by the focal length of the telescope
objective lens, which for this model is 750 mm. A formula can be used to determine the power of
each eyepiece: telescope OBJECTIVE lens focal length EYEPIECE focal length =
MAGNIFICATION (e.g. Using the 15 mm lens, the calculation would look like this: 750 mm ÷ 15mm
= 50x or 50 power.)
2. Included with this telescope is a Barlow lens. Barlow lenses are used to double or triple the power of
your telescope. Place your Barlow between the focusing tube and the penta mirror. Note: The
Penta Mirror Assembly when used in conjunction with the Barlow Lens and Eyepiece as
shown in the Intended Configuration Diagram will yield an effective doubling power of the
magnification already acheived with the Barlow and Eyepiece configuration alone. The
magnification calculation would look like this: 750 mm ÷ 20mm = 38 power. 38 power x 3=114
power. 38 x 3 x 2=228 power. (See Intended Configuration Diagram).
Focusing Telescope:
1. After selecting the desired eyepiece, aim main telescope tube at a land-based target at least 200
yards away (e.g. A telephone pole or building). Fully extend focusing tube by turning Rack and
Pinion Focusing Mechanism (13).
2. While looking through selected eyepiece (in this case the 20 mm), slowly retract focusing tube by
turning Rack and Pinion Focusing Mechanism until object comes into focus.
Aligning Finderscope:
Look through main telescope tube at low power and establish a well-defined stationary target. Looking
through red dot finderscope, alternate tightening each adjustment wheel (at rear and left side of
finderscope) until the red dot of finderscope is precisely aligned and centered on the same object being
viewed in main telescope tube. See finderscope page.
Now, objects located first with the Finderscope (16) will be centered in the field of view of the main
telescope.
Never Look Directly At The Sun With Your Telescope
Permanent Damage To Your Eyes May Occur