203 mm: one of the largest apochromats you can buy
The Askar 203/1421 belongs to the absolute top class: one of the largest apochromatic refractors currently available. With a 203mm aperture and 1421mm focal length (f/7), this is an instrument for observatories and high-end astrophotography, where light gathering power and resolution meet at the refractor level.
Observatory class, completely delivered
The air-spaced triplet objective delivers color-corrected images across the entire field of view. Dovetail mounting rings, Losmandy dovetail, dew shield, and 2-inch and 1.25-inch adapters are included in the box, along with a carrying case. This instrument requires an observatory mount; plan your setup before ordering.
In the box
- Optical tube 203/1421 triplet with air-spaced objective
- Tube Rings
- Losmandy dovetail
- Dew cap
- Adapters for 2 inch and 1.25 inch
- Transport case
For whom yes, for whom no
Who it's for: Observatories and professional setups that want to get the most out of a refractor. Who it's not for: Almost everyone else; for mobile or semi-fixed use, the 103 and 160 are the realistic choices.
Specifications
| Optical design | Apochromat, air-spaced triplet |
| Opening | 203 mm |
| Focal length | 1421 mm |
| Opening ratio | f/7 |
| Connection | 2 inches and 1.25 inches |
| Attachment | Mounting rings with Losmandy dovetail |
| Execution | OTA (loose tube) |
Unsure about the right tube for your camera and mount? The telescope selection aid helps you choose. Also view all Refracting telescopes and the full range of Askar.












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