Askar 203 APO 203mm f/7 Triplet Refractor Telescope
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The Askar 203APO is 203mm aperture, 1421mm focal length refractor with a focal ratio of f/7. It has a 20% larger effective aperture area than the 185APO and the limiting magnitude can reach 13.3. The large aperture provides an inherent advantage in terms of light-gathering power, resolution, brightness, and contrast, allowing the photographer to gather more light and present more details and brighter objects in the image.
The Askar 203APO adopts a triplet air-spaced APO lens design, including one piece of ED glass. The Askar APO series employs special optical designs and multiple lens elements to correct chromatic aberration, naturally providing higher-quality object details and color accuracy. In the refractor's element structure, increasing the number of lens elements and designing lens combinations can effectively improve chromatic aberration correction. However, this also means increased production costs and design complexity. ED glass, also known as low-dispersion glass, is a type of optical glass specifically designed to reduce chromatic aberration.
As a large aperture, long focal ratio OTA, the Askar 203APO was designed with portability in mind. Due to the retractable lens tube design, the shortest overall length is only 1145mm, the OTA weight is 18.5kg, and the gross weight is 23.5kg (including the handle, tube ring, and dovetail plate).
Each Askar 203APO is equipped with a unique name ring for identification. The retractable design of the dew shield, along with the enlarged locking screws, provide the user ease of use.
The 203APO's tube rings has an enhanced triple design, which is secures the OTA to the dovetail plates. The thumb screws enable easy opening and locking of the rings. Meanwhile, the base of the tube rings is heightened, providing more space.
The Askar 203APO has an extended 402mm handle with a special slot design, making it also a base for installing a finder scope. The dovetail plate of the Askar 203APO is the standard Losmandy dovetail plate, which is compatible with most equatorial mounts and bases on the market and is designed with multiple holes, which makes it easy to adjust the position. The length of the dovetail plate has been extended to 500mm, which is more convenient for balancing on the mount.
The rear lens tube of the Askar 203APO has an integrated retractable design. The overall stability is strengthened and ensures that the optical axis will not be affected when the lens tube is stretched, thus guaranteeing the quality of the image. The retractable part also features a rudder-type locking ring that makes it easy to loosen or tighten.
When the lens tube is extended, the 203APO can be connected to a diagonal and an eyepiece for observing. When the lens tube is contracted, the Askar 203APO can be used with a binoviewer for visual observation.
The Askar 203APO is equipped with a large dual-speed 3.5 inch rack and pinion focuser, which compatible with most motorized focusers on the market. There is a high-precision scale printed on the 100mm focusing travel. The entire focuser barrel is CNC machined with an anti-reflective internal design and matting paint, providing extra measures to eliminate stray light.
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 rear of the focuser features a 360° high-precision rotator, along with precise scales for convenient precise rotation adjustment. It is also equipped with an enlarged rotator locking screw that can be easily secured even under high loads.
In terms of visual observation, the focuser interface at the rear comes with a 1.25"/2" adapter, so the 203APO can easily achieve focus when connected to 1.25" or 2" diagonals or various eyepieces.
The entire Askar 203APO tube is crafted using high-quality CNC machining with anodized and painted surfaces. The orange accents on the ivory-white tube add a bright and eye-catching touch, presenting a stylish and elegant overall appearance.
Specifications:
- Aperture size: 203mm
- Focal length: 1421mm
- Focal ratio: f/7
- Objective lens: Triplet air-spaced APO (including one ED glass)
- Available backfocus (from the 1.25” eyepiece adapter with the focuser fully racked in): 335mm
- Total length: 1145mm (when the dew shield is contracted)
- The length of the rear retractable lens tube: 150mm
- Gross weight (including tube ring and dovetail plate): 23.5kg (51.8 lbs)
- OTA only weight: 18.5kg (40.8 lbs)
- Rear-end thread type: 2"/1.25" visual adapters
| Product Banner Type | new |
|---|---|
| Free Shipping Graphic | Free Contiguous US Shipping |
| Telescope Focal Length | 1251 - 1500mm |
| Hide Found a better Shipped Price on Frontend? | No |
- 1x Askar 203 APO OTA
- 1x Group of tube rings
- 1x Handle
- 1x Askar 500mm Losmandy dovetail plate
- 1x Aluminum box
- 1x Manual
The Askar 203APO is 203mm aperture, 1421mm focal length refractor with a focal ratio of f/7. It has a 20% larger effective aperture area than the 185APO and the limiting magnitude can reach 13.3. The large aperture provides an inherent advantage in terms of light-gathering power, resolution, brightness, and contrast, allowing the photographer to gather more light and present more details and brighter objects in the image.
The Askar 203APO adopts a triplet air-spaced APO lens design, including one piece of ED glass. The Askar APO series employs special optical designs and multiple lens elements to correct chromatic aberration, naturally providing higher-quality object details and color accuracy. In the refractor's element structure, increasing the number of lens elements and designing lens combinations can effectively improve chromatic aberration correction. However, this also means increased production costs and design complexity. ED glass, also known as low-dispersion glass, is a type of optical glass specifically designed to reduce chromatic aberration.
As a large aperture, long focal ratio OTA, the Askar 203APO was designed with portability in mind. Due to the retractable lens tube design, the shortest overall length is only 1145mm, the OTA weight is 18.5kg, and the gross weight is 23.5kg (including the handle, tube ring, and dovetail plate).
Each Askar 203APO is equipped with a unique name ring for identification. The retractable design of the dew shield, along with the enlarged locking screws, provide the user ease of use.
The 203APO's tube rings has an enhanced triple design, which is secures the OTA to the dovetail plates. The thumb screws enable easy opening and locking of the rings. Meanwhile, the base of the tube rings is heightened, providing more space.
The Askar 203APO has an extended 402mm handle with a special slot design, making it also a base for installing a finder scope. The dovetail plate of the Askar 203APO is the standard Losmandy dovetail plate, which is compatible with most equatorial mounts and bases on the market and is designed with multiple holes, which makes it easy to adjust the position. The length of the dovetail plate has been extended to 500mm, which is more convenient for balancing on the mount.
The rear lens tube of the Askar 203APO has an integrated retractable design. The overall stability is strengthened and ensures that the optical axis will not be affected when the lens tube is stretched, thus guaranteeing the quality of the image. The retractable part also features a rudder-type locking ring that makes it easy to loosen or tighten.
When the lens tube is extended, the 203APO can be connected to a diagonal and an eyepiece for observing. When the lens tube is contracted, the Askar 203APO can be used with a binoviewer for visual observation.
The Askar 203APO is equipped with a large dual-speed 3.5 inch rack and pinion focuser, which compatible with most motorized focusers on the market. There is a high-precision scale printed on the 100mm focusing travel. The entire focuser barrel is CNC machined with an anti-reflective internal design and matting paint, providing extra measures to eliminate stray light.
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 rear of the focuser features a 360° high-precision rotator, along with precise scales for convenient precise rotation adjustment. It is also equipped with an enlarged rotator locking screw that can be easily secured even under high loads.
In terms of visual observation, the focuser interface at the rear comes with a 1.25"/2" adapter, so the 203APO can easily achieve focus when connected to 1.25" or 2" diagonals or various eyepieces.
The entire Askar 203APO tube is crafted using high-quality CNC machining with anodized and painted surfaces. The orange accents on the ivory-white tube add a bright and eye-catching touch, presenting a stylish and elegant overall appearance.
Specifications:
- Aperture size: 203mm
- Focal length: 1421mm
- Focal ratio: f/7
- Objective lens: Triplet air-spaced APO (including one ED glass)
- Available backfocus (from the 1.25” eyepiece adapter with the focuser fully racked in): 335mm
- Total length: 1145mm (when the dew shield is contracted)
- The length of the rear retractable lens tube: 150mm
- Gross weight (including tube ring and dovetail plate): 23.5kg (51.8 lbs)
- OTA only weight: 18.5kg (40.8 lbs)
- Rear-end thread type: 2"/1.25" visual adapters
| Product Banner Type | new |
|---|---|
| Free Shipping Graphic | Free Contiguous US Shipping |
| Telescope Focal Length | 1251 - 1500mm |
| Hide Found a better Shipped Price on Frontend? | No |
- 1x Askar 203 APO OTA
- 1x Group of tube rings
- 1x Handle
- 1x Askar 500mm Losmandy dovetail plate
- 1x Aluminum box
- 1x Manual
Askar 203 APO 203mm f/7 Triplet Refractor Telescope # 203APO