William Optics Gran Turismo 81 APO w/ Internal Focus Design, Field Flattener & UniGuide

The William Optics Gran Turismo 81 APO with Internal Focus Design represents the cutting edge in apochromatic refractor technology. Engineered for precision astrophotography, this instrument boasts a revolutionary patented internal focusing mechanism integrated directly into the tube body, allowing for outstanding rigidity and weight distribution. This results in zero flexure and ultra-precise focusing control, even under heavy imaging loads.

Built around a high-quality FPL-53 APO triplet optical system, the Gran Turismo 81 provides superb color correction and razor-sharp imaging performance. This innovative OTA is equipped with a fully rotatable field rotator, adjustable field flattener (FLAT6AIII), and includes the WO UniGuide 32mm guide scope for a complete imaging setup. Whether you're shooting wide-field nebulae or high-resolution targets, this telescope is optimized for astrophotographers who demand top-tier optical and mechanical performance in a portable, premium-grade system.

• Aperture: 81 mm (3.25")
• Focal Length: 478 mm
• Focal Ratio: f/5.9
• Optical Design: Triplet Apochromatic Refractor
• Glass Type: FPL-53
• Focus Mechanism: Patented Internal Rack & Pinion System
• Field Flattener: FLAT6AIII Adjustable (Included)
• Rotator: Super Smooth Field Rotator with Degree Markings
• Focuser Features: Dual-speed with Numeric Display Window
• OTA Color: Red accents with white CNC-anodized aluminum body
• Compatible Cameras: DSLR, Mirrorless, Cooled CMOS/CCD
• Back Focus: Optimized for full-frame sensors (97% coverage)
• Free Shipping: Yes

• William Optics Gran Turismo 81 APO OTA with Internal Focus Design
• Built-in Rack & Pinion Precision Focuser
• WO FLAT6AIII Adjustable Field Flattener
• William Optics UniGuide 32mm Guide Scope – Red
• Cat Saddle Bar Handle
• Protective Carry Bag