Manufacturer: Kasai
Product number: WideBino28

EUR 184,95


incl. 19 % VAT (DE)  
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rating: 4.7 of 5
  • Details..
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  • In the box..
Kasai WideBino28 Opera Glasses - wide field of view for night observation
The look at the sky becomes an aha experience. At the beginning, the 2.3x magnification is not apparent, but where the unaided eye shows only a few stars, you will find yourself in a sea of stars. The number of stars increases up to ten times of the number visible to the naked eye. Extensive nebula regions suddenly become visible in their natural size. The Andromeda galaxy, hard to make out with the unaided eye, shows its entire size of about two degrees. You can lose yourself totally in the milky way.

When observing with the WideBino28, one does not have the impression of looking through binoculars. The impression is more like an eyesight intensifier The starry sky appears brighter, nebula regions become visible, you get deeper into the sky.

The optics of the WideBino28:
The base of the binoculars are opera glasses with Galilean optics. Omitting the erecting prisms results in surprisingly contrasty optics with a large and bright image and a huge field of view of 28° at night time, according to the manufacturer. This allows to observe complete constellations or regions of the milky way with dark clouds.

The field of view of Galileian telescopes varies with the pupil diameter of the observer, so a practical test at daylight, with narrow pupils, has shown only 21°.

The optical design of the WideBino28 consists of two extremely fast objectives (2-element meniscus objective system) and two eyepieces produced especially for this huge field of view. Stars are dot-like over the entire field.

Basically the field of view of Galilean opera glasses with their divergent eyepieces is very small. The only way to widen it is to use extremely fast (f/2 or faster) objective lenses. For this reason, the WideBino28 has 40 mm aperture, despite the calculation for Keplerian systems results in an exit pupil of 40 mm / 2,3 = 17,4 mm - far too oversized for the human eye.

Actually, the exit pupil of the WideBino28 equals the diameter of the eye pupil of the observer, and the entrance pupil is 2.3 times as large. If one´s eye has 7 mm pupil diameter in the dark, the entrance pupil will have 2.3 * 7 mm = 16.1 mm diameter.

Nebula filters for the ultimate observing thrill!
For the WideBino28, we offer an optional holder for nebula filters (Art. No. WB28-Filter). These metal holder are screwed to the objectives instead of the front rings. With the nebula filters, visibility of faint nebula structures increases enormously.

Note: A Galilean telescope system has no eye-relief. The best way to see the widest field of view is to "press" your eyes as close as possible to the eyepieces. When wearing eyeglasses, the field of view may be reduced. With very strong eyeglass prescriptions with stronger than -6 diopter, it may not be possible to reach the infinity focus. In such cases, wearing contact lenses is recommended.
Clear aperture:40 mm
Magnification:2.3x
True field of view:28° (depending on pupil size)
Max. dimensions:123x40x50 mm
Interpupillary distance:52-73 mm
Diopter compensation:+/6 dioptres
Focusing:By individual focusing
Weight:255 grams
WideBino28
Front & rear dust covers
Neckstrap
Soft carrying case with strap



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Reviews

Written by Otto Gut-Stocker
on 2018-06-13

"Gutes Produkt, als Verbesserung schlage ich eine beidseitige Skalierung für die Scharfeinstellung vor."

Written by Stefan Trcek
on 2018-02-28

"Die Vergrößerung ist 2,3 fach, nicht 23 fach. Das war die beste Investition in Astro Equipment. Man sieht viel mehr Sterne und erkennt gut viele Messier Objekte. Bestens um sich eine Übersicht zu verschaffen, und um Objekte überhaupt zu finden. Orion paßt etwa ins Gesichtsfeld. Man tut sich mit einem Teleskop dann wesentlich leichter, wenn man öfters mit dem Kasai und Feldstecher Objekte aufgesucht hat. Meine Kombination ist damit Kasai, Feldstecher, 10 Zoll Dobson. Verbesserungswunsch: Die Okulareinstellung ist etwas zu leichtgängig (verstellt sich zu leicht), und ein Mitteltrieb würde es für Erdbeobachtung tauglich machen, z.B. um Fledermäuse in der Dämmerung zu beobachten, denen man im Feldstecher kaum folgen kann. "

Written by Reinhard Kripahle
on 2018-02-22

"Nach einiger Übung (gerades, ruhiges Durchgucken!) erstaunlich gute Seherlebnisse. Nicht nur nächtens am Sternenhimmel, sondern auch bei Landschaften spektakulär. Nachteil: Fehlende Einstellungsmarken am Okular. "

Written by Jens Tietze
on 2018-02-10

"Gute Bildqualität leider beschlagen die Linsen innen"

Written by jean-yves touboulic
on 2018-01-02

*****

Written by jochen scharmann
on 2017-09-24

"Sehr praktisch auch als ""immer dabei"" Fernglas tagsüber: klein & leicht - die bessere Alternative zu den ""Operngläsern"". Durch die geringe Vergrösserung hat man einen ruhiges Bild. Ein minimalster lila Saum ist an harten Kontrastkanten sichtbar, nichts wirklich störendes, daher 5 Punkte. Für diese Grösse unschlagbar. "

Written by Emil Kolbert
on 2017-08-19

"Einfach toll für grab-and-go"

Written by Aymeric Vaissiere
on 2017-08-16

"Hervorragend für die Beobachtung einer Landschaft wie der Sternenhimmel."

Written by Andre Bois-Crettez
on 2017-07-13

"Light to carry, great and easy views of the stars. It seems like having super-night-vision, a lot of extra faint starts appear !"

Written by Edwin Zimmerli
on 2017-05-31

"Gut geeignet zur Beobachtung des Sternenhimmels. Produkt macht einen soliden Eindruck auf mich. Vorschlag: Skalen oder weisse Merk-Ringe zur groben Einstellung des Fokus wären hilfreich. "

Written by Remo Felder
on 2017-05-10

"Fantaschtisch, geniales Widefielderlebnis. "

Written by Bruce Whitson
on 2016-11-02

"Preisleistungs Verhältnis unschlagbar. Denkbar einfach in der Handhabung, eine echte Bereicherung unter gutem Himmel. "

Written by Udo Greiner
on 2016-10-05

"Man muss das Glas schon sehr nah und genau mittig vor die Augen halten, wird dann aber mit einem tollen Bild belohnt. Sehr weitwinklig (für den großen Wagen reicht es aber nicht ganz) und lichtstark (sehr viel mehr Sterne zu sehen, als ohne). Empfehlung!"

Written by Edward Cooper
on 2016-09-14

"Very satisfying. Very useful in light-polluted sky."