Askar 13028HNT-AL #

Description:
- The focusing device of 13028HNT-AL is a large dual speed gear rack focusing device that ensures a focusing stroke of 2cm as much as possible within structural limitations, and supports the replacement of electric focusing. The structure of the focusing device is very stable with a load capacity of 3kg. The back intercept also adopts the standard 55mm (calculated from the M48 threaded end face), making it easy for enthusiasts to get started.
- The dovetail board is of the standard Vixen type, with an extension of 290mm.
- 13028HNT-AL is made of all metal material, with aluminum lens barrel and CNC machined mechanical connection components.
- The corrector in the focuser adopts a doublet lens design, one of which is an ED glass, enhancing the power in aberration correction.

Specification:
- Main lens type: Hyperbolic reflective mirror
- Main lens material: PZ33 (similar to Pyrex glass)
- Corrector: Two-element air-spaced refractive lenses (including one ED glass)
- Aperture size: 130mm
- Focal length: 364mm
- Focal ratio: f/2.8
- Back-focus: 55mm
- Field of view: 6.9 degree
- Image circle: 44mm
- Minor axis of secondary lens: 65mm
- Resolution: 0.89 arc second
- Limiting visual magnitude: 12.3
- Main tube material: Aluminum
- Main lens barrel outer diameter: 174mm
- Main lens barrel length: 400mm
- OTA weight: 3.8kg
- Gross weight (including tube ring and dovetail plate): 4.8kg

Askar 15028HNT-AL #

Description:
- 15028HNT-AL is a hyperbolic primary lens Newtonian reflector with a diameter of 150mm and a focal ratio of ultra short F2.8.
- The 15028HNT-AL supports full frame shooting with a 44mm imaging circle and delicate star point performance.
- The focusing device of 15028HNT-AL is equipped with two built-in refractive corrector, one of which is made of ED glass, which enhances the ability to control color difference.
- The 15028HNT-AL further enhances the stability of the main lens optical axis in terms of mechanical structure design. Three sets of push-pull adjustment screws are designed at the bottom of the main lens barrel to adjust the angle of the main mirror.
- The 15028HNT-AL has improved the structure of the secondary lens bracket, making it more stable. The secondary lens bracket is manufactured using an integrated CNC manufacturing process, without misalignment, ensuring a beautiful and perfect cross shaped star during astronomical photography.
- There is a finderscope base on the side of the barrel, which can be used to install a finderscope or other required astronomical accessories.
- The focusing device of 15028HNT-AL is a large dual speed gear rack focusing device, which ensures a focusing stroke of 2cm as much as possible within the structural limitations and supports the replacement of electric focusing. The structure of the focusing device is very stable with a load capacity of 3kg. The back intercept also adopts the standard 55mm (calculated from the M48 threaded end face), making it easy for enthusiasts to get started.
- The dovetail board is of the standard Losmandy type, with a length of 200mm and a handle length of 200mm.
- 15028HNT-AL is made of all metal material, with aluminum lens barrel and CNC machined mechanical connection components.

Package Included:
- 1 x Telescope

Askar 13028HNT-AL

Askar 15028HNT-ALL