Use and Care Manual

SPECIFICATIONS
StarPro™AZ 70 model:
Objective lens diameter 70mm(2.8”)
Optical tube focal length 700mm
Focal ratio f/10
Mounting type Alt-azimuth
Viewfinder Red-dot
StarPro™AZ 80 model:
Objective lens diameter 80mm(3.2”)
Optical tube focal length 900mm
Focal ratio f/11.3
Mounting type Alt-azimuth
Viewfinder Red-dot
StarPro™AZ 90 model:
Objective lens diameter 90mm(3.5”)
Optical tube focal length 600mm
Focal ratio f/6.7
Mounting type Alt-azimuth
Viewfinder Red-dot
StarPro™AZ 102 model:
Objective lens diameter 102mm(4.0”)
Optical tube focal length 660mm
Focal ratio f/6.5
Mounting type Alt-azimuth
Viewfinder Red-dot
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What do the specifications mean?
Optical tube focal length is the distance
light travels in the telescope before being
brought to focus in you eyepiece. Depending
on the telescope model, the focal length is
either 600mm to 900mm long. Look at the
specification table to find out your telescopes
focal length.
Objective lens diameter is how big the
front lens is on your scope. Telescopes are
always described by how large their objective
lens is. Depending on your telescope model,
the lens diameter is either 70mm - 102mm.
Other telescopes are 50mm, 8 inches, 16
inches, or even 3 feet in diameter. The
Hubble Space Telescope’s objective lens
has a diameter of 2.4 meters (that’s 7.8 feet
across!).
The focal ratio helps determine how fast the
photographic speed of a telescope is. The
lower the focal ratio number, the faster the
exposure. f/5 is faster than f/10. The faster
the ratio, the shorter the exposure time
is needed when a camera is hooked up to
the telescope. For example, the Infinity 80
telescope has fast focal ratio at f/5.
Looking at or near the Sun will cause irreversible damage to your eye. Do not point this telescope at or near the Sun. Do not look through the telescope as it is moving.