BTX Eyepiece

Product Overview

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.

Optical Performance

Dual identical eyepieces
65/85mm Objective: 30x magnification with 65mm/85mm objective models; 35x magnification with 95mm 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)
Exit Pupil: 2.2mm (65mm) / 2.9mm (85mm) / 2.7mm (95mm)
Long, 21mm eye relief on all models

SWAROVISION System

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 interpupillary 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