Askar FRA300 300/5 APO fi 60 mm

The Askar FRA series offers professional-grade refractors renowned for their exceptional optical and mechanical quality, tailored specifically for astrophotography enthusiasts. In 2022, the series welcomed its latest addition, the FRA 300 PRO model, featuring a compact design without compromising on light output.

The Askar FRA 300 PRO is an elite astrograph that boasts a cutting-edge optical system comprising five lenses arranged in the Petzval configuration. To combat chromatic aberration effectively, the manufacturer incorporated an additional lens made of low-dispersion glass. Moreover, the multi-layer anti-reflective coatings on the glass surfaces ensure remarkable contrast for astrophotography.

Both the mechanical and optical aspects of the design have been optimized to facilitate seamless integration with digital SLRs and professional astronomical cameras. The solid 2.5-inch rack & pinion focuser, equipped with microfocus capabilities, guarantees precise adjustments even under heavy loads. Additionally, the large diameter circle provides full illumination, enabling enhanced imaging performance.

Key Features of the Askar FRA 300 PRO Optical Tube:

• Apochromatic Quintet with Low-Dispersion Glass: The optical system comprises five lenses, including one crafted from low-dispersion glass. This apochromatic configuration ensures excellent color correction, resulting in high-quality astrophotography.
• Large Light Gathering Capability: With a focal ratio of f/5, the FRA 300 PRO allows for shorter exposure times, capturing stunning celestial imagery efficiently.
• Robust 2.5" Rack & Pinion Focuser: The instrument features a sturdy rack & pinion focuser with a 2.5" diameter, enabling precise alignment, even with heavy equipment.
• Circle of Full Illumination: The instrument boasts a generous 44 mm diameter circle of full illumination, maximizing the utilization of the optical system's capabilities.

Technical Specifications:

• Optical System: Apochromatic ED-APO Quintuplet utilizing the Petzval pattern with an air gap
• Number of ED Glass Elements: 1
• Objective Diameter: 60 mm
• Focal Length: 300 mm
• Focal Ratio: f/5
• Anti-Reflective Coating: Full Multi-layer Coating (FMC)
• Circle Diameter of Full Illumination: 44 mm
• Back Focus (M42x0.75): 71 mm
• Back Focus (M48x0.75): 67 mm
• Back Focus (M54x1): 71 mm
• Focuser Diameter: 2.5"
• Eyepiece Extractor Type: Rack & Pinion with 10:1 Microfocus and 360° rotation capability
• Focuser Thread: M48x0.75
• Mounting Foot: Vixen
• Tube Length: 303 mm
• Tube Weight (with accessories): 3.1 kg
• Tube Weight (without accessories): 2.3 kg

Included Components:

• Askar FRA 300 PRO Optical Tube
• Mounting Rings
• Carrying Handle
• Vixen Foot (300 mm)
• Adapters for M42x0.75 Thread
• Documentation

Warranty:

The Askar FRA 300 PRO comes with a 24-month guarantee, providing peace of mind for your astrophotography endeavors.