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Explore Scientific BT Series SF Giant Binoculars
Explore Scientific BT-70 SF Giant Binoculars

Explore Scientific BT Series SF Giant Binoculars

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Model Selections
01-14200 BT-70 SF Giant Binocular with 62 Degree LER Eyepieces (+CAD2,159.00)
01-14210 BT-82 SF Giant Binocular with 62 Degree LER Eyepieces (+CAD2,429.00)
01-14220 BT-100 SF Giant Binocular with 62 Degree LER Eyepieces (+CAD2,699.00)
01-14230 BT-120 SF Giant Binocular with 62 Degree LER Eyepieces (+CAD3,179.00)
Product Highlights
  • Observe Moon, Planets, Deep Sky Objects
  • 70mm/80mm/100mm/120mm Objective, 400mm/470mm/550mm/660mm Focal Length
  • 62° 20mm Eyepieces, 20x/24x/28x/ Magnification

Observe the beauty of the starry sky at night and distant objects in nature during the day with the BT-70 SF Giant Binoculars from Explore Scientific. Globular star clusters, glowing gas nebulae, the moon with its craters, and even planets can be observed wonderfully on a clear night. With the all-round binoculars of the Explore Scientific BT series, you can get up very close. Thanks to large, light-gathering lenses and professional coatings on all lens surfaces, these binoculars produce bright and brilliant images, even at night and at twilight. The comfortable 45° viewing angle allows fatigue-free use even when the binoculars are tilted.

The BT series binoculars are designed for tough outdoor use. The IPX6-sealed and nitrogen-filled design effectively prevents fogging of the internal optics, even under difficult weather conditions. The very light magnesium housing saves weight and makes it easy to handle. Two 20mm eyepieces of the 62° LER (long eye relief) series are included. With an apparent field of view of 62° and a focal length of 20mm, the BT-70 binoculars produce 20x magnification. These wide angle eyepieces offer a very good overview (field of view 3.1°) at moderate magnification. The large 15mm eye relief and soft silicone eyecups, which can be turned inside out, guarantee a comfortable and relaxed view. Due to the waterproof design and the argon filling, these eyepieces are durable and easy to clean.

Interchangeable 1.25" Eyepieces
Adjust the magnification and field of view to your individual needs and choose from a wide range of available eyepieces. All eyepiece types with a plug-in diameter of 1.25" can be used with the binoculars of the BT series. The eyepieces are held in the binoculars by a precise brass compression ring clamp and guarantee tilt free positioning.
Use of Color and Nebula Filters
Increase the contrast and visibility of objects and details by screwing the corresponding filters directly into the thread of the eyepiece sleeves. The use of color and nebula filters must, of course, always be done in pairs.
Comfortable 45° View and Helical Single Focus
The 45° viewing angle allows a relaxed observation position even when the binoculars are tilted. Also the individual interpupillary distance can be adjusted in a range of 54 to 76mm. With fine helical individual focusing, precise focusing is achieved effortlessly.
Extendable Dew Caps
The integrated dew caps can be removed in high humidity and cold conditions. This avoids fogging of the outer objective lenses and effectively shields additional control light coming in from the side.
Integrated Metal Handle
A metal carrying handle located at the center of gravity facilitates transport and ensures a secure hold during tripod assembly.
Suitable Tripods & Tripod Connection
When using these large binoculars, a sturdy photo tripod with an appropriate load capacity is essential. The connection is made via two 1/4" or one 3/8" threaded holes (standard photo tripod thread) in the tripod adapter of the binoculars. The ideal solution is to use the optional available Explore Scientific U-Mount with field tripod (item No. 01-14300). This is specially designed for the large binoculars of the BT series and carries these devices safely. The excellent mechanism with adjustable friction in both axes allows easy moving and tracking. The binocular position is kept stable depending on the adjusted friction intensity. Vibrations are reduced to a minimum by the massive construction of the U-Mount and the large stainless steel tripod. Even at high magnification there are no vibrations and the finest details can be observed.

Explore Scientific BT-70 Overview

Prism TypePorro
Performance
Magnification20x
Objective Lens Diameter70 mm
Angle of View3.1° (Actual)
62° (Apparent)
Minimum Focus DistanceNone
Exit Pupil Diameter3.5 mm
Eye Relief15 mm
Interpupillary Adjustment54 to 76 mm / 2.1 to 3"
Diopter AdjustmentNone
Focus TypeIndividual
Features
FogproofYes, Nitrogen Filled
Water ResistanceIPX6
General
Dimensions14.6 x 8.4 x 4.8" / 370 x 213 x 122 mm
Weight7.5 lb / 3.4 kg


Explore Scientific BT-100 Specs

Prism TypePorro
Performance
Magnification28x
Objective Lens Diameter100 mm
Angle of View2.3° (Actual)
62° (Apparent)
Minimum Focus DistanceNone
Exit Pupil Diameter3.6 mm
Eye Relief15 mm
Interpupillary Adjustment54 to 76 mm / 2.1 to 3"
Diopter AdjustmentNone
Focus TypeIndividual
Features
FogproofYes, Nitrogen Filled
Water ResistanceIPX6
General
Dimensions20.5 x 10.6 x 6.1" / 520 x 270 x 155 mm
Weight15 lb / 6.8 kg


Explore Scientific BT-120 Specs

Prism TypePorro
Performance
Magnification33x
Objective Lens Diameter120 mm
Angle of View1.8° (Actual)
62° (Apparent)
Minimum Focus DistanceNone
Exit Pupil Diameter3.6 mm
Eye Relief15 mm
Interpupillary Adjustment54 to 76 mm / 2.1 to 3"
Diopter AdjustmentNone
Focus TypeIndividual
Features
FogproofYes, Nitrogen Filled
Water ResistanceIPX6
General
Dimensions25.7 x 11.4 x 6.1" / 654 x 290 x 156 mm
Weight18.3 lb / 8.3 kg


In the Box

  • Explore Scientific BT Series SF Giant Binocular
  • Limited 1-Year Warranty

Customer Reviews

I recently purchased the Explore Scientific BT-82 SF Binocular Telescope and I am absolutely delighted with it! I had wanted a really nice large binocular for quite some time. Something that would be a "grab & go" observing instrument. I had tried out various 70mm, 80mm, even 100mm straight through, single power binoculars, but even when mounted solidly on an appropriate tripod, they were all very difficult to use!

I also have an ES Twilight 1 mount & tripod that I had purchased a while back to use along with another telescope as "grab & go" observing package. This mount works great and provides a solid platform for observing with the bino's! The slow motion controls on the Twilight 1 mount provide an added feature when tracking an object smoothly across the sky!

I have been extremely happy with the views through this Bino-telescope! The build quality and overall finish is superb in this instrument. They are quite heavy though, weighing in at around 10 pounds, so they have to be solidly mounted to enjoy using them! One other tiny "nit" I have with them is the plastic threaded screw on front lens caps. Out in the field in the dark you have to be very careful that you don’t cross-thread the plastic caps! I solved this issue by purchasing some soft vinyl slip-on covers that fit over the front of the lens hoods. I would highly recommend this Explore Scientific BT-82 SF Binocular Telescope for anyone looking for a low power, wide-filed of view observing instrument!


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