Manufacturer: Kasai
Product number: STELLABINO50

EUR 499,00


incl. 19 % VAT (DE)  
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Kasai StellaBino-50 Binocular Telescope
StellaBino-50 is a completely new concept "inverted image" binocular telescope designed specifically for astronomical observations, combining two high-performance 50 mm f/4 refractors. The simple structure does not include prisms, yielding much clearer and sharper images than those of ordinary binoculars. The eyepieces are interchangeable, so you can freely choose the magnification and FOV. Filter work is also easily available. Furthermore, since there is no FOV restriction due to the prism size limit, the maximum FOV can be secured with 1.25" eyepieces. A unique design that combines a binoculars-like form that can be easily hand-held with the basic functions and structure required of an astronomical telescope. The 660 g lightweight body ensures a comfortable grip in the hands, while also featuring the same specifications as a full-fledged astronomical telescope. This is truly a one-of-a-kind, revolutionary binocular telescope created "only" for astronomy enthusiasts.

Development Concept

Ordinary binoculars are originally designed for terrestrial viewings. Of course, they can also be used for astronomical observations, but this is merely a "repurposed" use, as an "erect image" is always an absolute requirement for the original use. However, in order to obtain this erect image, multiple prisms must be incorporated, which inevitably lead to deterioration of image quality and loss of light. Furthermore, the size of the prisms also limits the field of view. For example, in the case of typical 50 mm binoculars, it is physically impossible to secure a FOV of over 7° regardless of the magnification. (Of course, there are some models that incorporate huge prisms to achieve an ultra-wide field of view, but they are generally very heavy, large, and extremely expensive.) Furthermore, the fixed magnification is also inconvenient. The eyepieces are also built into the housing, so it is no easy to attach filters.

On the other hand, astronomical telescopes generally produce inverted images, and it is well known that this is to maintain and maximize the performance of the objective lenses. Most astronomers are familiar with inverted images from using telescopes, so the factor of "erect image" is not always necessary as long as it is specialized for astronomical observations. Rather, the benefits (sharpness, wide field of view, brightness, etc.) gained by discarding this factor are far greater. While, the facts that the eyepieces can be switched, the magnification can be easily changed, no FOV restriction, and filters can be freely attached, are all major advantages and indispensable factors for astronomical observations.

Considering these points, the starting point of the development of this device was "to create a pair of binoculars dedicated to astronomical observations that maintains the convenience and operability of binoculars while being equipped with the functions of an astronomical telescope." After several years of conception and multiple prototypes, Kasai was finally able to produce and sell this device.

Optics

High-precision 50 mm f/4 doublet achromat objective lenses are designed and manufactured for astronomical use. Full broadband multi-coating achieves high transmission rate as 99.5%. Unlike normal binocular objective lenses, very sharp and clear iamges can be maintained up to a high magnification range of 20-30x. Chromatic aberration is also well corrected, and is suppressed to a level that is almost unnoticeable at magnification ranges within the practical range for deep-sky observaton use. Combined with a simple structure without prisms, clearer image quality that is far superior to that of ordinary 50 mm binoculars can be obtained.

Focuser

Butter-smooth rotary helical focusers are equipped. The focusing operation is the same as IF binoculars, familiar for any binocular users.16 mm travel and 8 mm maximum backfocus can reach the infinity focus with most eyepieces. Low profile fastening screws with metal compression rings for the 1.25" eyepiece adapters can secure good centering retention, holding eyepieces reliably and accurately.

Eccentric-Rings Collimation Function

StellaBino-50 is always shipped with well pre-collimated state, but, as is the fate of binocular telescopes with interchangeable eyepieces, the perfectly collimated state may not always be maintained during actual use. For example, when using heavy and/or large eyepieces, the eyepiece adapter parts may bend slightly, causing a slightly misalignment. In order to make it easy for users to solve this problem, collimation functions are equipped on both the tubes. This structure is generally called an "eccentric-rings collimation mechanism," a method of connecting two slightly eccentric rings and rotating both of them appropriately to adjust the collimation state of both the tubes. Normally it´s installed inside the objenctive lens cell, and no easy for users to adjust them. However, in StellaBino-50, these mechanisms are equipped between the main tubes and the eyepiece adapters so that users can access these functions and adjust the collimation state easily whenever necessary.

General Aptitude

StellaBino-50 is a unique pair of binocular telescopes made "only" for astronomy enthusiasts. The eyepieces can be changed, so you can freely choose the magnification and FOV. You can also use filters freely. There is no FOV limitation by prisms. Even with two normal eyepieces, the total weight is less than 1 kg, so it can be used easily by hand-held. And, the greatest feature is that the simple structure without prisms provides a very bright, clear, and sharp image quality. Please enjoy the splended deep-sky views with your both eyes with eye-opening clarity.
Aperture:50 mm
Focal length:200 mm
Focal ratio:f/4
Interpupillary distance:58 mm - 74 mm
Focusing:Independent focusing
Focusers:Rotary helical focusers / 1.25" eyepiece adapters with metal compression rings
Max. dimensions:255 mm × 120 mm × 57 mm
Weight:660 g
Binoculars
Objective lens dewcaps
Neckstrap

Manufacturer / Importeur:Teleskop-Service Ransburg GmbH
Street:Von-Myra-Str. 8
ZIP / City:85599 Parsdorf
Country:Germany
Telefon number:+49 89 99228750
Email:info@teleskop-service.de
Website:www.teleskop-service.de
Safety informations: PDF Download


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