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Omegon Binoculars Nightstar 20+40x100 Triplet with Variable Eyepieces


Quick Overview

These large observation binoculars are ideal for low power deep sky observation of larger targets and come with 2 sets of eyepieces, giving 20x and 40x magnification respectively. The triplet objectives supply a good level of colour correction, but it's generally recommended to keep magnifications below 100x, in order to get the best out of them.
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Availability: In stock



With an objective diameter of 100mm, the Omegon Nightstar provides a very bright image and is perfect for observing the night sky. The new three-element design substantially improves image colour - it can therefore be ranked among the half-apochromats or semi-apo binocular ranges.

These binoculars have connectors which accept 1.25” eyepieces, so there's nothing standing in the way of using your own eyepieces. Due to the relatively short focal length of 560mm however, the magnification used is nt recommended to exceed 100X. The binoculars come with two pairs of eyepieces already included, allowing you to select between magnifications of 20X or 40X. The use of separate 1.25" eyepieces now also allows the observer to use nebula filters for observing DSOs.

These large binoculars let you to observe the night sky in particular comfort -  because using both eyes is less strenuous and much more fun. The large objective diameter makes a rich variety of objects visible. Objects appear differently compared to the view through a telescope, they seem three-dimensional. In addition, there are two 100mm apertures providing more light gathering capacity than the single aperture of a 100mm telescope, with which one observes monocularly anyway. Open clusters, extended emission nebulas and other DSOs can all be well seen.

Omegon Nightstar 20+40x100 Triplets are optically and mechanically outstandingly well-constructed binoculars.

The advantages in a nutshell:

  • wide range of standard 1.25“eyepieces usable

  • multi-coated optical surfaces

  • very sharp field of view

  • eyepieces separately focusable

  • viewing distance can be precisely adjusted

 Included in delivery:

  • adjustable aluminium dew shields with front end caps

  • removable carrying handle, attached with two hand screws

  • tripod adapter with ¼“ threaded socket

  • 20X eyepiece set (multi-coated) and 40X eyepiece set (multi-coated)

  • lockable aluminium carrying case with moulded padding


Type of build Porro prisms
Magnification 40 (20+40)
Front lens diameter (mm) 100
Exit pupil (mm) 5,0 (5,0 at 20x / 2,5 at 40x)
Eye relief (mm) 18,0
Diopter compensation +/- 4
Interpupillar distance (mm) -
Glass material BaK-4
Focusing system Single focusing
Lens coating fully, multiple
Diopter-adjustment side on both sides (Single eyepiece focusing)
Special features
Zoom function -
Eyepieces for spectacle wearers -
Image stabilizer -
Compass -
Rangefinder -
Splash-proof yes
Protection bag Aluminium case
Threaded tripod connector Direct connection w/o adapter
Watertight no
Field of view
True field of view (°) 2,7 (2.5 at 20x / 1.5 at 40x)
Apparent field of view (°) 54,0 (54 at 20x / 58.4 at 40x)
Field of view at 1,000 m (m) 47 (47 at 25x / 25 at 40x)
Close focus limit (m) 7,5
Light intensity 25,0 (25.0 at 20x / 6.3 at 40x)
Twilight factor 63,2 (44,7 at 20x / 63,2 at 40x)
Surface material Rubber armouring
Colour black-silver
Length (mm) 445
Width (mm) 260
Height (mm) 133
Weight (g) 7450

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