EXPLORE SCIENTIFIC BT-100 SF Large Binoculars with 62 degree LER Eyepieces 20mm

EXPLORE SCIENTIFIC BT-100 SF Large Binoculars with 62 degree LER Eyepieces 20mm
BT-100 SF large binoculars with 62 degree LER eyepieces 20mm for observing the night sky and terrestrial objects. Always with you on any excursion.

Light intensive large binoculars with 100 mm objective lens diameter.
Observation of the starry sky and terrestrial objects
Extremely robust binoculars, sealed and nitrogen-filled
Comfortable 45-degree viewing and single focusing, carrying handle
Two high quality ES 62 degree LER eyepieces 20mm Ar included
Eyepiece mount 1.25 inch/31.7mm, eyepieces interchangeable
Matching ES 62 or 82 degree series eyepieces available
Retractable dew caps prevent fogging on objectives
Tripod mount: 2 x 1/4 inch and 1 x 3/8 inch photo thread
Optional accessories: Art.0114300 U-mount with field tripod

Large binoculars for observing the night sky, nature and landscape

View the beauty of the night sky by night and distant objects in nature by day. Globular clusters, luminous gas nebulae, the moon with its craters and even planets can be wonderfully observed on a clear night. But also all other far away things in nature and landscape, even ships and airplanes can be seen in detail. With the all-round binoculars of the EXPLORE SCIENTIFIC BT series, you can bring it all very close. With large, fast lenses and state-of-the-art coatings on all lens surfaces, these binoculars produce bright, brilliant images even at night and dusk for a special viewing pleasure. Convenient 45-degree viewing allows fatigue-free use even when the binoculars are tilted sharply.

A large binocular can also be called a double refractor telescope
One complete refracting telescope with full light gathering power is available per eye. Experience a whole new dimension of seeing. Objects are reproduced almost plastically in these binoculars and observing with both eyes is basically very relaxed. Last but not least, this comfortable way of observation increases the recognition of finest details and effectively prevents rapid eye fatigue.

Extremely robust binoculars with magnesium housing, sealed and filled with nitrogen
BT series binoculars are designed for tough outdoor use. Sealed to IPX6 standards and filled with nitrogen, they effectively prevent fogging of the internal optics even in harsh weather conditions. The very lightweight magnesium housing saves weight and facilitates handling.

Two EXPLORE SCIENTIFIC 20 mm eyepieces of the 62 degree LER series already included
EXPLORE SCIENTIFIC is an established manufacturer for extremely high quality eyepieces in the astronomy scene. An optical system is only as good as its weakest component. That's why we decided to deliver these large binoculars with a pair of quality eyepieces of the 62 degree LER series. With an apparent field of view of 62 degrees and a focal length of 20mm, the BT-100 binoculars produce 28x magnification. Thus, these wide-angle eyepieces provide a very good overview at moderate magnification (field of view 2.3 degrees). The large eye relief of these LER (long eye relief) eyepieces of 15 mm and soft foldable eyecups made of silicone, also guarantee a comfortable and relaxed view. For astronomy, a leveled field of view that is sharp all the way to the edge is an advantage and offers a particularly impressive viewing experience even during the day. Due to the waterproof design and the argon filling, these eyepieces are absolutely insensitive and easy to clean.

Interchangeable eyepieces with 1.25 inch/31.7 mm plug-in diameter.
Customize the magnification and field of view to suit your individual needs and choose from a wide range of available eyepieces. All eyepiece types with a 1.25 inch/31.7 mm plug-in diameter can be used with BT series binoculars. Particularly recommended are EXPLORE SCIENTIFIC eyepieces of the 62 and 82 degree series with focal lengths from 8 to 26 mm (see Art. No.02188xx u. 02196xx). The magnification can be varied from approx. 21x to 70x (focal length binoculars : focal length eyepiece = magnification). The eyepieces are held in the binoculars by a precise brass ring clamp and guarantee a tilt-free position.

Use of color and nebula filters for astronomical observations.
Increase contrast and visibility of objects and details by screwing the appropriate filters directly into the thread of the eyepiece sleeves. Of course, color and nebula filters must always be used in pairs. Suitable are all EXPLORE SCIENTIFIC screw-in filters with 1.25''/31.7 mm diameter (see Art. No. 03102xx)

Convenient 45-degree viewing and single focusing
The 45-degree viewing angle allows a relaxed observation position even when the binoculars are heavily tilted. The individual interpupillary distance can also be adjusted within a range of 54 to 76 mm. Precise focusing is effortless with the fine helical single focusing system.

Retractable dew caps
The integrated dew caps can be pulled out in high humidity and cold conditions. This prevents fogging of the outer objective lenses and effectively shields additional stray light entering from the side.

Integrated carrying handle
A metal carrying handle mounted at the center of gravity facilitates transport and provides a secure grip during tripod mounting.

Suitable tripods and tripod mount
When using these large binoculars, a sturdy photo tripod with an appropriate load capacity is highly recommended. The connection is made via two 1/4 inch or one 3/8 inch threaded holes (standard photo tripod thread) in the tripod base of the binoculars. Ideal is the use of the optionally available EXPLORE SCIENTIFIC U-mount with field tripod (Art. No. 0114300). This has been specially designed for the large binoculars of the BT series and supports these instruments absolutely securely. The fine-action mechanism with adjustable friction in both axes allows easy adjustment and tracking. Depending on the adjusted intensity of the friction, the binocular position is kept stable. Vibrations are reduced to a minimum by the solid construction of the U-mount and the large stainless steel tripod. Even at high magnification there is no shaking and finest details can be observed.

PROPERTIES
Large binoculars for observing the starry sky, nature and landscape
Observe globular clusters, luminous gas nebulae, the moon with its craters and even planets
Wildlife, ships and airplanes can also be seen in detail
High-luminosity objectives produce a bright and high-contrast image
All-around binoculars, but especially good at twilight and at night
Comfortable 45-degree field of view allows for fatigue-free use
One complete lens telescope with full light gathering power is available per eye
Extremely rugged binoculars with magnesium housing, sealed and filled with nitrogen
Two EXPLORE SCIENTIFIC 20 mm eyepieces of the 62 degree LER series already included
28x magnification and an apparent field of view of 62 degrees, true field of view 2.3 degrees
Large eye relief of 15 mm to the eyepiece lens with comfortable viewing
Eyepieces are interchangeable and with standardized plug-in diameter of 1.25 inch/31.7 mm
Optional eyepieces allow magnification to be adjusted from approximately 21x up to 70x
Precise brass eyepiece ring clamps for a tilt-free fit

Use of color and nebula filters possible for astronomical observations
Retractable dew caps prevent fogging of the outer objective lenses and shield stray light
Integrated carrying handle facilitates transport and mounting on the tripod
Tripod connection via two 1/4 inch or one 3/8 inch threaded hole (standard photo tripod thread)
Optional tripod recommendation: EXPLORE SCIENTIFIC U mount with field tripod (Art. No. 0114300)

Objective type: Air-gap achromat (2 elements/ 1 group)
Coating: full multi-coating on all optical surfaces
Objective aperture, focal length and focal ratio: 100 mm / 550 mm / F=5.5
Sealed to IPX6 standard and nitrogen filled: yes / yes
Close focus distance: 25 meters
Eyepiece mount diameter: 1.25''/31.7 mm
Adjustable interpupillary distance: 54 to 76 mm
Helical single focus: yes
Dimensions and weight binoculars: 520 x 270 x 155 mm (LxWxH), 6.8 kg
Housing color binoculars: white