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Swarovski BTX 30x / 35x Eyepiece Module for ATX / STX Spotting Scopes

Swarovski BTX 30x / 35x Eyepiece Module for ATX / STX Spotting Scopes

Regular price £2,389.00
Regular price Sale price £2,389.00
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  • View with Both Eyes Open
  • 45° Angled Viewing
  • 35x with 95mm/115mm Models
  • 30x with 65mm/85mm Models
  • 63° Wide Apparent Angle of View
  • Nitrogen-Filled, Water and Fog-proof
  • Removable and Adjustable Forehead Rest
  • Twist-Up Rubber Eyecups
  • Integrated Aiming Aid with Reticle

Fully compatible with all versions of their ATX and STX spotting scope systems, Swarovski Optik's BTX 30x/35x Eyepiece Module represents the pinnacle of comfort for long-duration glassing sessions. The innovative design replaces the conventional single eyepiece with a dual-eyepiece binocular configuration that enables users to view with both eyes open, and with the eyepieces set at a 45° angle to the optical tube, their head is put in a natural viewing position. When mounted on the 65mm and 85mm models it has a 30x magnification, whereas the 95mm version is stepped up to 35x. Both models have a 63° wide apparent angle of view. To match the performance of the objective modules, this eyepiece module has the SWAROVISION system to improve color fidelity, contrast, and clarity; and SWAROCLEAN coatings help keep the lenses clear and easy to clean.

To improve stability and maintain the optimal head position relative to the eyepieces is an adjustable forehead rest. The rest can be removed if users find it more comfortable to use without it. Like the rest of the modules in the ATX/STX family, the Eyepiece module is nitrogen-filled to make it resistant to internal fogging when moving through extreme temperature changes, and is also O-ring sealed to be waterproof and submersible. Because finding targets through angled eyepieces is sometimes challenging, Swarovski provides an innovative aiming aid. The unmagnified device is placed in front of and to the side of the right eyepiece and is zeroed to the optical tube, so users simply look through the sight hole and center their subject in the reticle. Like the forehead rest, the aiming aid can be removed if users prefer to use the integrated sight on the objective modules shade.

Optical Performance

  • Dual identical eyepieces
  • 65/85mm Objective: 30x magnification with 65mm/85mm objective models; 35x magnification with 95mm & 115mm model
  • Proprietary SWAROVISION system improves image contrast, color, and clarity
  • Wide Apparent Angle of View: 63° 
  • Field of View at 1000 Yards: 114' (65mm) / 111' (85mm) / 96' (95mm) / 92’ (115mm)
  • Exit Pupil: 2.2mm (65mm) / 2.9mm (85mm) / 2.7mm (95mm) / 3.3mm (115mm)
  • Long, 21mm eye relief on all models


  • High-definition (HD) fluoride glass lenses eliminate chromatic aberrations for accurate color fidelity, and improved resolution and contrast
  • Field-flattener lenses correct spherical aberrations for distortion-free views, especially at the edges
  • SWAROTOP anti-reflective multi-coating that enhances light transmission
  • SWARODUR coatings provide enhanced scratch resistance
  • Non-stick SWAROCLEAN coatings on exposed lens surfaces ensure that water, dirt, sap, and oil can be easily removed without scratching or leaving residue

Use and Handling

  • Provides comfortable both-eyes-open viewing, with reduced, fatigue during long-duration observation sessions
  • Eyepieces set at 45° angle to optical tube for comfortable viewing while sitting, standing, or lying prone
  • Forehead rest improves viewing stability, is adjustable for optimal eye relief and viewing comfort, and is removable if preferred
  • Innovative aiming aid utilizes an unmagnified view with a sunburst-type reticle to find subjects faster and easier than using the angled eyepieces
  • 56-72mm inter-pupillary adjustment range
  • ±4 right-eye dioptric correction
  • Multi-position twist-up rubber eyecups offer comfortable use with or without eyewear
  • Simple bayonet mount for fast installation and removal

Construction Details

  • Nitrogen-filled and O-ring sealed to be water and fog-proof
  • Submersible to 13.1' (4.0m)
  • Operating temperature: -13 to 131°F (-25 to 55°C)
  • Tethered one-piece ocular rain-guard
  • Weight: 3.1 pounds

What’s Included?

  • Swarovski BTX 30x/35x Eyepiece Module for ATX/STX Spotting Scopes
  • Mount Cap
  • One-Piece Eyepiece Cap
  • Limited 10 Year  Manufacturer Warranty



With 65 mm Scopes: 30x
With 85 mm Scopes: 30x
With 95 / 115 mm Scopes: 35x

Angle of View

With 65 mm Scopes: 2.1° (Actual)
With 85 mm Scopes: 2.1° (Actual)
With 95 / 115 mm Scopes: 1.8° (Actual)

Field of View

With 65 mm Scopes: 114' @ 1000 yd / 38 m @ 1000 m
With 85 mm Scopes: 111' @ 1000 yd / 37 m @ 1000 m
With 95 / 115 mm Scopes: 96' @ 1000 yd / 32 m @ 1000 m

Exit Pupil Diameter

With 65 mm Scopes: 2.2 mm
With 85 mm Scopes: 2.9 mm
With 95 / 115mm Scopes: 2.7 mm

Eye Relief

21.0 mm

Diopter Correction

-4.0 to +4.0


Yes, Nitrogen Filled

Environmental Protection

Water-Resistant (Unrated)


L: 6.9" / L: 17.4 cm


3.1 lb / 1.4 kg

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