5
(Picture #4)
6.) Loosen the small chrome screw on the side of the focus tube by turning it
counterclockwise. Insert the shiny chrome end of the diagonal mirror into the focus
tube so that the opposite open end is facing upward. Tighten the small chrome screw
on the side of the focus tube to hold the diagonal mirror securely in position. (Picture
#4)
7.) Loosen the small chrome screw located on the side of the diagonal mirror by
turning it counterclockwise.
(Picture #5)
8.) Insert the low power eyepiece marked “H20mm” into the diagonal mirror. Tighten
the small chrome set screw by turning it clockwise to hold the eyepiece securely in
place. (Picture #5)
THE ALTAZIMUTH MOUNT
The C90T telescope is fitted with an Altazimuth mount. “Altitude" refers to the
vertical, or “up and down” movement of the telescope, while "Azimuth" refers to the
horizontal, or “side-to side” movement.
ABOUT MAGNIFICATION
The magnification power of a telescope indicates how much an image is enlarged or how
big and close it appears to the viewer. The focal length of the eyepiece, combined with
the focal length of the telescope, determine the magnification power. To calculate the
