WILLIAM OPTICS FLAT 68III

WILLIAM OPTICS FLAT 68III

The William Optics 68III adjustable field flattener is an advanced design crafted for refractors with focal ratios between f/6 and f/7.5. CNC-machined and optimized for the FLT132, 102GTS, and other William Optics apochromatic refractors, the 68III delivers exceptional performance, producing beautifully round stars across the field.

Lens

• Supports full-size DSLR cameras with a 50 mm clear aperture.

• Equipped with premium doublet air-spaced optics featuring STM coatings.

• Built entirely from high-quality Ohara glass.

• True 1x flattener – no focal reduction.

• Provides a fully illuminated 45 mm imaging circle.

Elegant Finish

• Signature William Optics anodized exterior.

• Internally threaded and fully blackened to reduce reflections.

• Supplied with protective caps on both ends.

Easy to Use

• Compatible with any M48x0.75 threaded camera T-ring.

• Fits the William Optics FLT132 and 102GTS (with 3" focuser), along with other refractors using an M92x1.0 focuser thread.

Adjustment Distances

• 102GTS: 13.6 mm

• FLT132: 7.7 mm