Binorum Super Plössl 40mm 50° SPL 1.25″ Eyepiece

The Binorum Super Plössl 40mm is a premium-quality eyepiece designed for versatile astronomical observing. Featuring a 50° field of view and a standard 1.25″ barrel, this eyepiece is compatible with virtually any telescope, making it ideal for both beginner and experienced stargazers. Whether you are exploring the Moon, planets, star clusters, or nebulae, the 40mm Super Plössl delivers stunning, clear, and immersive views.

Bright, sharp, and natural-looking images

The Super Plössl optical design ensures excellent image quality, producing sharp and high-contrast views across the entire field of view. Lens edges are blackened to reduce internal reflections, while the fully multi-coated (FMC) optical surfaces maximize light transmission and minimize ghosting. This provides a crisp, vibrant, and true-to-life image, enhancing every detail of celestial objects.

Perfect for wide-field observing and deep-sky objects

Thanks to its long 40mm focal length, this eyepiece is particularly suited for wide-field observing, offering expansive views that make it easy to locate and track large deep-sky objects such as nebulae, galaxies, and open star clusters. You can comfortably sweep across the Milky Way or enjoy the full view of large celestial objects without constantly repositioning your telescope.

Comfortable and user-friendly

A foldable rubber eyecup protects your eyes from stray light and ensures comfortable viewing, whether you wear glasses or not. Its standard 1.25″ barrel guarantees compatibility with most telescopes and focusers on the market. The wide eye relief makes extended observing sessions easy on the eyes, reducing fatigue during long nights under the stars.

Build a complete eyepiece collection

The Binorum Super Plössl series offers a wide range of focal lengths to suit any observing situation:

6 mm, 6.4 mm, 7.5 mm, 8 mm, 10 mm, 12 mm, 12.5 mm, 15 mm, 17 mm, 18 mm, 20 mm, 25 mm, 32 mm, 40 mm.

The 40mm Super Plössl is perfect as a low-power, wide-field eyepiece that complements higher-magnification options in your set, giving you the flexibility to enjoy both detailed planetary observation and expansive deep-sky vistas.

Choose the Binorum Super Plössl 40mm for a reliable, high-performance eyepiece that combines sharpness, brightness, and exceptional comfort. Whether you are just starting in astronomy or expanding your telescope accessories, this eyepiece will enhance your stargazing experience night after night.

Specifications

Type of eyepiece: Super Plössl

Focal length: 40 mm

Connection type: 1.25″

Apparent field of view: 50°

Eye relief: 18 mm

Coating of optical system: FMC

Telescope parameters using this eyepiece

Aperture mm

Focal length telescope mm

Specifications:

Magnification:

Telescope magnification is calculated by dividing the telescope's focal length by the eyepiece focal length. A Barlow lens also affects magnification: the power increases according to the Barlow's multiplication factor.

Field of View:

The field of view is the angular size of the sky area visible through the telescope with a given eyepiece. It depends on both the magnification and the eyepiece's apparent field of view. For comparison, the Moon's average apparent diameter is 0° 31' 5" (0.518°).

Exit Pupil:

The exit pupil is the diameter of the light beam that exits the eyepiece and enters your eye. A larger exit pupil produces a brighter image. Exit pupil is calculated by dividing the aperture diameter by the magnification.

Focal Ratio:

The focal ratio (also called f-number or f-stop) is the ratio of the telescope's focal length to its aperture diameter. Telescopes with focal ratios from f/4 to f/6 are typically called "fast" telescopes, suitable for both visual observation and astrophotography. Telescopes with focal ratios between f/6 and f/15 are better suited for visual observation than photography, and generally make it easier to achieve higher magnifications.

Resolution (Dawes Limit):

Resolution is the angular size of the smallest details and objects that can be distinguished through this telescope under excellent observing conditions. This theoretical limit assumes perfect optics and atmospheric conditions.

Limiting Magnitude:

This is the faintest star magnitude visible through this telescope under excellent observing conditions with dark, clear skies and a fully dark-adapted eye.

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This product is available in the following variants:
Binorum Super Plössl 12.5mm 50° SPL 1.25″ Telescope Eyepiece	40.40 €
Binorum Super Plössl 6mm 50° SPL 1.25″ Eyepiece	44.30 €
Binorum Super Plössl 6.4mm 50° SPL 1.25″ Eyepiece	44.50 €
Binorum Super Plössl 7.5mm 50° SPL 1.25″ Eyepiece	44.70 €
Binorum Super Plössl 8mm 50° SPL 1.25″ Eyepiece	44.90 €
Binorum Super Plössl 10mm 50° SPL 1.25″ Eyepiece	45.15 €
Binorum Super Plössl 12mm 50° SPL 1.25″ Eyepiece	45.35 €
Binorum Super Plössl 15mm 50° SPL 1.25″ Eyepiece	46.15 €
Binorum Super Plössl 17mm 50° SPL 1.25″ Eyepiece	46.35 €
Binorum Super Plössl 18mm 50° SPL 1.25″ Eyepiece	46.55 €
Binorum Super Plössl 20mm 50° SPL 1.25″ Eyepiece	46.80 €
Binorum Super Plössl 25mm 50° SPL 1.25″ Eyepiece	49.25 €
Binorum Super Plössl 32mm 50° SPL 1.25″ Eyepiece	50.05 €
Binorum Super Plössl 40mm 50° SPL 1.25″ Eyepiece	52.95 €

Binorum Super Plössl 40mm 50° SPL 1.25″ Eyepiece