Binorum Plössl 10mm Eyepiece 50° 1.25″ - Quality Optics for Amateur Astronomy

Eyepiece Binorum Plössl 10mm 50° 1.25″

A Time-Tested Design That Delivers

The Plössl eyepiece design has been a favorite among amateur astronomers for decades, and for good reason. What makes it special is its simple yet ingenious construction. With just 4 optical elements working together, these eyepieces deliver a bright and high-contrast image that brings celestial objects to life—all at a price that won't break the bank. We believe this is one of the best eyepieces you can get in this price range.

What Makes This Eyepiece Stand Out

Rubber eyeguards shield your view from stray light coming from the sides, ensuring you see only what matters
Anti-reflective coating on the lenses lets you see objects brilliant and bright, with minimal light loss
Universal 1.25″ barrel fits virtually every modern telescope on the market
Built to last with quality metal construction that will serve you for years to come
Filter threads let you simply screw on a moon or nebula filter and start observing enhanced details

Great Performance, Even with Fast Telescopes

These eyepieces feature excellent edge sharpness, even when used with "fast" f/5 telescopes. If you're familiar with camera lenses, you'll understand this concept: the lower the f-number, the more light-gathering power your telescope has, making it "faster." F/5 telescopes are among the fastest out there, and this eyepiece performs beautifully with them.

Technical Specifications

Focal length: 10 mm
Optical design: Plössl, 4 elements in 2 groups
Apparent field of view: 50°
Barrel diameter: 1.25″ (31.7 mm)
Anti-reflective coating: Multi-coated optics
Rubber eyeguard: Foldable
Filter thread: Standard M28.5 × 0.6

Perfect For

With its 10mm focal length, this eyepiece provides medium to high magnification suitable for observing:

Lunar craters and surface details
Planetary features like Jupiter's cloud bands
Double stars
Globular clusters
Bright nebulae and galaxies

Why Choose Binorum

Binorum eyepieces combine traditional optical designs with modern manufacturing standards and quality control. The Plössl series offers reliable performance and excellent value, making them a popular choice for astronomers at every level—from those just starting out to experienced observers expanding their eyepiece collection.

Specifications

Type of eyepiece: Plössl

Focal length: 10 mm

Connection type: 1.25″

Apparent field of view: 50°

Number of optical components / single lenses: 2/4

Coating of optical system: Multiple

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 Plössl 3,6mm 43° 1.25″ Ultra High Power Planetary Eyepiece	39.35 €
Binorum Plössl 4mm 52° 1.25″ Eyepiece	39.35 €
Binorum Plössl 6mm 52° 1.25″ Planetary Eyepiece	39.75 €
Binorum Plössl 6,5mm 50° 1.25″ Planetary Eyepiece	40 €
Binorum Plössl 10mm 50° 1.25″ Eyepiece	40.20 €
Binorum Plössl 12,5mm 50° 1.25″ Eyepiece	40.20 €
Binorum Plössl 20mm 50° 1.25″ Eyepiece	40.20 €
Binorum Plössl 40mm 45° 1,25″ Eyepiece	41 €

Binorum Plössl 10mm 50° 1.25″ Eyepiece