SkyWatcher AC 90/900 EvoStar: Professional Refractor for Tactical Operations

The SkyWatcher AC 90/900 EvoStar delivers precision optics and rugged reliability for demanding field applications. This 90mm achromatic refractor features exceptional light-gathering capability and f/10 optical design, making it ideal for long-range observation, surveillance tasks, and tactical reconnaissance where accuracy is paramount.

Techical Specifications SkyWatcher AC 90/900

Professional Optical Performance

The 90mm multi-coated achromatic objective utilizes crown and flint glass elements to minimize chromatic aberration while maximizing light transmission. This air-spaced doublet design ensures sharp, high-contrast images essential for target identification and detailed observation at extended ranges.

Light-gathering advantage: The 90mm aperture provides 65% more light than 70mm models and 125% more than 60mm telescopes, enabling enhanced performance in low-light conditions and dawn/dusk operations.

Field-Ready Design

Aluminum tube construction provides optimal weight-to-strength ratio for portable field deployment. The collapsible dew shield prevents moisture accumulation on the objective lens during extended observation sessions, while protective lens caps ensure optical integrity during transport.

Rapid deployment: Tool-free assembly enables 15-20 minute setup from carrying case to operational status, crucial for time-sensitive reconnaissance missions.

Mount Configuration Options

AZ-3 Alt-Azimuth Mount

• 360-degree azimuth rotation with 90-degree elevation range

• Smooth slow-motion controls for precise target tracking

• Quick-release locks for rapid repositioning

• Adjustable aluminum tripod (78.5-150cm height range)

EQ-2 Equatorial Mount

• Single-axis tracking capability for extended observation

• Counterweight system for perfect balance

• Polar alignment for astronomical applications

• Motor drive compatibility for automated tracking

Complete Tactical Package

Standard accessories include two Super eyepieces (10mm/90x and 25mm/36x), 6x30 finderscope with crosshair reticle, 90-degree star diagonal, and smartphone adapter for digital documentation.

Professional enhancements available: erecting prism for correct image orientation, solar filter for specialized observation, and protective carrying case for secure transport.

Operational Capabilities

Long-Range Observation

Jupiter's atmospheric bands, Saturn's ring system, and Mars surface features clearly visible at appropriate magnifications. Lunar surface details resolved down to 2km crater diameter, demonstrating extreme-range reconnaissance potential.

Terrestrial Applications

• Perimeter security monitoring

• Wildlife observation and conservation enforcement

• Border patrol and coastal surveillance

• Search and rescue coordination

FAQ Section

Q: How do I align the finderscope?
A: Point telescope at distant terrestrial object (minimum 100 meters), center in main eyepiece, then adjust finderscope screws until crosshairs align with same target.

Q: Why can't I achieve sharp focus?
A: Check eyepiece cleanliness, try different magnification, ensure focuser travels full range, and verify atmospheric conditions aren't causing image distortion.