Open Box scopes are in like new condition with warranty. A great opportunity to save big on a quality optic!

Features

• 91mm APO Triplet for tack-sharp stars
• 3.3" heavy duty dual-speed focuser can handle the heaviest imaging loads
• Rotolock system for 2" diagonal
• Refined anodized aluminum finishing
• Included 2" extension tube for close focus or camera connection (if you can't reach focus, remove the 2" extension tube when used with a 2" diagonal and eyepiece or with cameras and flatteners.)

A precision-engineered apochromatic triplet refractor designed for discerning astronomers and astrophotographers. This mid-sized telescope features a 91mm aperture with FPL-53 glass, delivering sharp, high-contrast images and an impressive Strehl ratio exceeding 0.95.

Equipped with user-centric features, the FLT91 includes an integrated saddle handle, a 360º field rotator, a dual-speed 3.3" Rack & Pinion focuser, and a 2" Rotolock system. These enhance usability and provide stability for both visual and photographic applications.

Astrophotographers will find the built-in Bahtinov mask invaluable for achieving perfect focus effortlessly. Compatible with the Flat 6AIII, Flat 68III, and Ultra Flat 91, the FLT91 allows precise back-focus adjustments.

Constructed with William Optics' signature quality, the FLT91 is both lightweight and durable, weighing 4.2 kg and 5.6 kg fully equipped. It comes with a soft carry case for easy transportation and protection.

Ideal for capturing celestial phenomena, the William Optics FLT91 is a top choice for those seeking advanced optical performance in a portable package.

Example Images

Diagram Reports

Specifications

Online Manual