Binorum Planetary Pro 9mm 1.25″ Eyepiece

Binorum Planetary Pro 9mm 58° 1.25″ Eyepiece

Six-element optics built for planetary detail

The Binorum Planetary Pro planetary eyepiece is built around a six-element optical system that keeps the image sharp right to the edge of the field of view and reduces chromatic aberration to an absolute minimum. When you observe Jupiter's cloud bands, Saturn's rings, or lunar craters, the image stays sharp and contrasty - no false colour fringing at the edges, no scattered light burying fine detail in a haze. A 58-degree field of view gives you a comfortable window on the sky for easy orientation, while every detail is rendered with a precision you simply will not find in cheaper eyepieces. The result is a viewing experience where the optics stay out of the way.

Comfortable eye relief - ideal for glasses wearers

For a 9mm focal length, the exit pupil is surprisingly generous. That brings one very practical benefit: you can use this eyepiece comfortably with glasses on without losing any part of the field of view. For many astronomers this is an everyday detail that ultimately decides which eyepiece they reach for - especially during long observing sessions when comfort at the eyepiece makes all the difference.

Maximum contrast through careful light management

The entire interior barrel is blackened, and all internal baffles feature anti-reflection micro-damping on their edges together with full black anodising. This combination effectively eliminates unwanted internal reflections that would otherwise degrade contrast. All air-to-glass surfaces carry broadband multi-layer anti-reflection coatings that maximise light transmission and deliver as many photons as possible directly to your eye. The result is a bright, high-contrast image even under conditions where every photon counts.

Twist-up eyecup and projection photography support

The Binorum Planetary Pro 1.25″ eyepiece comes with a screw-type twist-up eyecup fitted with a flexible rubber cover. You can adjust the eye relief height smoothly and precisely - whether you observe with glasses or without. This detail has a real impact on comfort during long nights, when a tired eye appreciates every millimetre of the correct position. The eyepiece also supports projection photography with a DSLR camera or a compact camera, making it a reliable choice for astrophotographers looking for quality optical accessories.

About Binorum

Binorum is a Czech brand created by practising astronomers and designed around the demands of real observing sessions. The philosophy is straightforward: quality optics and precise build quality without unnecessary compromise. The Binorum range covers a wide selection of eyepieces, filters, and other accessories, so every observer - whether a beginner or an experienced amateur - can put together exactly the kit they need. Binorum is built on long-term reliability and on the principle that every product detail has a reason to be there.

Technical specifications