Vixen SD115S OTA ES26148 — 115 mm SD Apochromatic Refractor Optical Tube Assembly

The Vixen SD115S OTA ES26148 is a premium 115 mm SD‑glass apochromatic refractor tube, designed for serious visual astronomy and high-quality astrophotography. The large 115 mm aperture and 890 mm focal length (f/7.7) deliver bright, high-contrast, and wide-field views — perfect for deep-sky objects, star clusters, nebulae, galaxies, as well as detailed lunar and planetary observations.

Using Vixen’s advanced SD glass (FPL53) in a fully multicoated apochromatic lens system, this OTA minimizes chromatic and spherical aberrations, giving crisp, sharp, and true-color images across the field. Designed for both eyepiece observation and imaging, the SD115S supports 2" and 1.25" eyepieces, and its drawtube includes T‑ring/camera threads — ready for prime-focus or afocal astrophotography.

The tube comes equipped with a flip-mirror diagonal with dual eyepiece holders, dovetail mounting plate, tube rings with carry handle, and a 7×50 mm illuminated finder — making it easy to mount, transport, and use on various mounts (sold separately).

Features & Benefits

• Large 115 mm SD-glass apochromatic objective — Delivers bright, high-contrast, color-accurate images with minimal chromatic aberration.

• Wide and versatile focal ratio (f/7.7, 890 mm) — Excellent balance for both deep-sky and detailed planetary or lunar viewing.

• Optimized for astrophotography and visual use — Supports 2″ and 1.25″ eyepieces; drawtube offers T‑ring/camera mounting for prime-focus or afocal imaging.

• Flip-mirror diagonal with dual eyepiece holder — Allows easy switching between two eyepieces or between visual and imaging setups.

• Ready to mount and transport — Includes dovetail plate, tube rings with carry handle, and 7×50 mm illuminated finder to simplify setup and star-hopping.

• Strong light-gathering & sharp resolution — 115 mm aperture and SD optics provide excellent performance for faint objects with crisp star images.

Specifications