Explore Scientific 1.25" 3X Focal Extender

The Explore Scientific 1.25" 3x Focal Extender triples your eyepiece magnification in a single step, pushing mid-range eyepieces into high-power planetary territory while preserving their comfortable eye relief. A 15mm eyepiece becomes a 5mm equivalent.

Built around the same telecentric optical design, with multiple precision lens elements, used across the entire Explore Scientific focal extender line, the 3x keeps magnification consistent regardless of spacing in the optical path.

The lightest and most compact model in the lineup at 249g and 93mm, the 3x adds minimal weight to your focuser assembly.

Key Features

• Four-element telecentric design, fully multi-coated with EMD coatings
• Filter thread for color and nebula filters
• Triples magnification while preserving full eye relief from the base eyepiece
• Lightest and shortest focal extender in the lineup (249g / 93mm)

Ideal For

• Planetary observers — reach high magnification from a comfortable, long-eye-relief eyepiece without buying a dedicated short-focal-length model
• Compact setups — the smallest and lightest extender minimizes balance shift on lightweight telescopes
• Filling magnification gaps — three eyepieces offer six magnification choices with the addition of a focal extender