Askar Z4 100 F/5,5 APO ED OTA

The Sharpstar Z4 sets a new standard for professional astrographs, offering outstanding optical parameters and unparalleled craftsmanship. This bright refractor is designed specifically for wide field photography of deep sky objects, making it a top choice among astrophotographers.

At the heart of the Sharpstar Z4 astrograph lies a cutting-edge six-element optical system with f/5.5 lenses. These lenses are arranged in two groups, resulting in a flawlessly corrected field curvature. One remarkable feature of this apochromat is the implementation of two low dispersion glass (ED) lenses. This groundbreaking technology achieves the highest degree of chromatic aberration correction, addressing the primary optical flaw found in most lens instruments. The telescope is equipped with a robust focuser with a 3.4" diameter, enabling precise focusing thanks to its 1:10 gear ratio. Additionally, the Sharpstar Z4 astrograph comes with an adapter that allows compatibility with various astrophotographic cameras featuring different mounting threads.

In addition to its innovative optics design, the Sharpstar Z4 stands out as the first model in the company's lineup to showcase a new, distinctive design. Both the tube and the mounting brackets feature an elegant matte gray finish, providing the astrograph with a sophisticated aesthetic appeal.

Key Features of the Sharpstar Z4:

High-class six-element astrograph featuring two low dispersion lenses.

Optical system ensuring impeccable field curvature compensation.

Full illumination circle diameter: 36 mm.

Four-element adapter facilitating the connection of a wide range of cameras or photographic equipment.

3.4" diameter focuser with a built-in rotator for precise framing.

Technical Specifications:

• Optical design: Apochromatic refractor.
• Lens system: ED sextlet with air gap.
• Number of low dispersion lenses: Two.
• Front lens diameter (aperture): 100 mm.
• Focal length: 550 mm.
• Focal ratio: f/5.5.
• Diameter of full illumination circle: 36 mm.
• Back focus: 55 mm (from M48 thread).
• Camera/camcorder adapter: Four elements (M86x1 - M68x1 / M68x1 - M54x0.75 / M54x0.75 - M54x0.75 / M54x0.75 - M48x0.75).
• Filter installation capability: Adapter M54x0.75 - M48x0.75.
• Focuser diameter: 3.4".
• Focuser type: Rack & pinion with 360° rotator, 1:10 ratio.
• Mounting compatibility: Dovetail foot.
• Total length: 482 mm.
• Tube weight (excluding accessories): 4.3 kg.

Included Components:

• Sharpstar Z4 optical tube.
• Four-element photo adapter.
• Mounting clamps with a handle.
• 300 mm Dovetail rail.
• Documentation.

Warranty:

The Sharpstar Z4 comes with a 24-month guarantee, providing you with peace of mind and assurance in the quality and durability of your astrograph.