SHARPSTAR Askar 120APO User manual

120 APO
User s Manual
，
www.sharpstar-optics.com

The Askar 120APO is an OTA with 120mm aperture, 840mm focal
length, and f/7 native focal ratio.
Askar 120APO adopts a triplet air-spaced APO lens design, including
one piece of ED glass.
The entire lens tube of Askar 120APO is crafted using high-quality
CNC machining, with anodized and surface spray paint treatment. All
the inner of the Askar 120APO's dew shield is covered with matting
felt, and inside the main tube, it is coated with matting paint and
equipped with the internal baffle. The retractable design of the dew
shield, along with the enlarged locking screw, prevents the dew
shield from slipping.
There are two finder bases on both sides of the focuser, which not
only eliminates the need for disassembling when changing the
position of the finder scope but also provides additional mounting
positions for other astronomical accessories.
The tube rings of the Askar 120APO have a light weight of only 780g.
The handle has a special slot design, making it able to attach other
accessories that need a finder base. The CNC thumb screws of the
tube rings enable easy opening and locking without other tools. The
standard Vixen dovetail plate, which is compatible with most equato-
rial or Altitude-azimuth mounts on the market, has an additional
screw hole position design for adjusting the position of the tube ring
and the plate. The length of the plate reaches up to 290mm, making
it more convenient for balancing on the equatorial mount.
The Askar 120APO adopts a segmented lens tube design. It allows
binoculars to be used for visual observation when the extension tube
is disassembled. With the extension tube, the Askar 120APO can be
English
Instructions for use

Aperture󵿎size:120mm
Focal󵿎length:840mm
Focal󵿎ratio:f/7
Objective󵿎lens:󵿎Triplet󵿎air-spaced󵿎APO(including󵿎one󵿎ED󵿎glass)
Total󵿎length:722mm(when󵿎the󵿎dew󵿎shield󵿎is󵿎contracted)
󵿎󵿎󵿎󵿎󵿎󵿎󵿎󵿎󵿎󵿎󵿎󵿎󵿎󵿎󵿎󵿎󵿎󵿎804mm(when󵿎the󵿎dew󵿎shield󵿎is󵿎stretched)
Net󵿎weight:5.7kg
Gross󵿎weight:6.5kg
Rear-end󵿎adapter:2"adapter,1.25"adapter
Standard󵿎 package󵿎 items:󵿎 an󵿎 120APO󵿎 OTA,󵿎 a󵿎 pair󵿎 of󵿎 tube󵿎 rings,󵿎 a󵿎
handle,󵿎an󵿎Askar󵿎290mm󵿎Vixen󵿎dovetail󵿎plate,󵿎an󵿎Oxford󵿎cloth󵿎case，󵿎
a󵿎manual
used with the 0.8x reducer or 1x flattener, or attaching a diagonal for
visual observation.
In terms of the focuser, the Askar 120APO is equipped with a CNC
machined dual-speed R&P large 3.3-inch rigid focuser, which can be
compatible with most motorized focusers on the market. The focuser
provides 100mm focusing travel, is equipped with a high-precision
big 360° rotator, and adopts laser-engraved scales in the length
direction and the circumference direction, which is convenient for
adjusting and recording. It is also equipped with an enlarged rotator
locking screw, preventing image shifting during shooting. Inside the
focuser tube, there is an anti-reflective internal design and matting
paint, providing extra measures to eliminate stray light.
The Askar 120APO is an OTA that emphasizes the compatibility of
observing equipment.It can easily achieve focus when connected to
1.25" or 2" diagonals or various eyepieces. Because of the segmented
lens tube design, it can also be attached to a binoviewer for visual
observation.

120 APO
User s Manual
，
www.sharpstar-optics.com
① ② ③ ④ ⑤
120APO OTA, a pair of tube rings,
a handle, a 290mm Vixen dovetail plate
Instruction manual
A transportation bag
Items in 120APO Packaging
The Locking Screw Position Diagram
③Bottom Locking Screw
②Bottom Load Adjustment Screw
①③④⑤can be used for electric focusing
bracket installation
Warranty card Check list
Qualified certificate

①
Product Parts and the Size Diagram
Steps of Detaching the Extender Tube
240mm
6.3mm
20mm
6.3mm
290mm
M4
200mm 6mm
18
40mm
34mm
15
189mm
240mm
100mm
146mm 139mm
110mm
220mm
722mm
20mm
200mm
Adjust the tube ring to the position shown
Lock the tube ring screw
The focuser needs to be positioned
beyond the dovetail plate
handle
tube rings rotator
1.25''adapter
2''adapter
coarse adjustment knob
bottom locking screw
290mm Vixen dovetail plate
bottom load adjustment screw
fine adjustment knob
coarse adjustment knob
finder base
finder base
rotator locking screw

③
④
⑤
②
Unscrew the focuser
First, stretch the lens hood Then adjust the tube ring to the position shown
The end of the dovetail plate
must exceed the lens tube
Unscrew the rear
section of the lens tube
After screwing up the focuser,
the rear section of the lens tube is removed

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