Askar 103APO Refractor Telescope User Manual
- June 12, 2024
- Askar
Table of Contents
Askar 103APO Refractor Telescope
Product Information
The Askar 103APO is an OTA with the following specifications:
- Aperture size: 103mm
- Focal length: 700mm
- Focal ratio: f/6.8
- Objective lens: Triplet air-spaced APO (including one ED glass)
- Total length: 600mm (when the dew shield is contracted), 711mm (when the dew shield is stretched)
- Net weight: 4.75kg
- Gross weight: 5.5kg
- Rear-end adapter: 2″ adapter, 1.25″ adapter
The package includes the following items
- 103APO OTA
- A pair of tube rings
- A handle
- An Askar 290mm Vixen dovetail plate
- A transportation bag
Product Usage Instructions
- Detaching the Extender Tube:
- Lock the tube ring screw.
- Position the focuser beyond the dovetail plate.
- Adjust the tube ring to the specified position.
- Unscrew the focuser.
- Stretching the Lens Hood:
- Adjust the tube ring to the specified position.
- Ensure that the tube is beyond the rear end of the dovetail plate.
- Unscrew the rear section of the lens tube.
For visual observation, you can attach a 0.8x reducer or 1x flattener, or use a diagonal with the Askar 103APO. It is compatible with 1.25″ or 2″ diagonals and eyepieces. The Askar 103APO features a segmented lens tube design, allowing it to be attached to a 0.6x reducer or a bino viewer with the extender tube detached. The lens tube of the Askar 103APO is crafted using high-quality CNC machining and has an anodized surface spray paint treatment. The dew shield is retractable and equipped with an enlarged locking screw to prevent slipping. The inner of the dew shield is covered with matting felt, and the main tube is coated with matting paint and equipped with an internal baffle. The Askar 103APO has two finder bases on both sides of the focuser, eliminating the need for disassembling when changing the position of the finder scope and providing additional mounting positions for other astronomical accessories. For more information, please refer to the Askar website or consult the provided instruction manual.
Instructions for use
The Askar 103APO is an OTA with a 103mm aperture, 700mm focal length, and f/6.8 native focal ratios. Askar 103APO adopts a triplet air-spaced APO lens design, including one piece of ED glass. The entire lens tube of Askar 103APO is crafted using high-quality CNC machining, with anodized and surface spray paint treatment. All the inner of the Askar 103APO’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 103APO have a light weight of only 750g. The
handle has a special slot design, making it able to attach other accessories
which 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 equatorial 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 103APO adopts a segmented lens
tube design. It can be attached to a 0.6x reducer or a binoviewer with the
extender tube detached. While with the extender, the Askar 103APO can be used
with a 0.8x reducer or 1x flattener, or attaching a diagonal for visual
observation.
In terms of the focuser, the Askar 103APO is equipped with CNC machined dual-
speed R&P large 3.3-inch rigid focuser, which can be compatible with most
motorized focusers on the market. It provides 100
focusing travel, equipped with a high-precision heavy composition rotator, and
adopts laser-engraved scales in the length direction and the circumference
direction, which is convenient for user adjustment and
information 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. Last but not least, the Askar 103APO is a
product that pays great attention to the compatibility of visual accessories,
so it is compatible whenever attached to 1.25” or 2” diagonals and eyepieces.
- Aperture size: 103mm
- Focal length: 700mm
- Focal ratio: f/6.8
- Objective lens: Triplet air-spaced APO (including one ED glass)
- Total length: 600mm (when the dew shield is contracted)
- 711mm (when the dew shield is stretched)
- Net weight: 4.75kg
- Gross weight: 5.5kg
- Rear-end adapter: 2″ adapter, 1.25″ adapter
- Standard package items: a 103APO OTA, a pair of tube rings, a handle, an Askar 290mm Vixen dovetail plate, a manual， a transportation bag
Products Parts and the Size Diagram
Steps of Detaching the Extender Tube
Items in 103APO Packaging
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