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.

View with Both Eyes Open    45° Angled Viewing    35x with 95mm Models    30x with 65mm/85mm Models    63° Wide Apparent Angle of View    SWAROVISION and SWAROCLEAN Systems    Nitrogen-Filled, Water and Fogproof    Removable and Adjustable Forehead Rest    Twist-Up Rubber Eyecups    Integrated Aiming Aid with Reticle

• 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

• 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

• 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

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

Related Questions and Answers

Q: 1. Is this 115mm model compatible with the older DH101 head as direct mount? Thanks.

A: Yes, this this 115mm model is compatible with the older DH101 head as a direct mount.

Q: 2. does it work with Leica 25-50 ww asph?

A: No it's a Swarovski Eye Cup for ATX/STX Spotting Scopes.

Q: 3. What is the minimum focus distance with the STX eyepiece at 30x? Thanks!

A: The minimum focus distance with the Swarovski STX Spotting Scope Modular Zoom Eyepiece (Straight Viewing) BH #SWSTXMES • MFR #49902 is the same for the 95mm: 15.7' / 4.8 m

Q: 4. Which tripod head works with the 115mm scope?

A: A wide variety of tripod heads will work with the Swarovski ATX/STX/BTX 115mm Objective Lens Module. here are (2) suggestions: Gitzo 2-Way Fluid Head BH #GIGHF2W • MFR #GHF2W or the Swarovski CTH Compact Tripod Head BH #SWCTH • MFR #49078

Q: 5. Reviewer Cynthia said, "and you can't carry it attached to your tripod like you can with other scopes". Is this true? I need a scope I can carry on the tripod constantly, and weight is not an issue. Would this scope qualify? Thank you for any info you can provide.

A: You can carry it on a tripod. The scope weighs 3 lbs without the eyepiece. I would not suggest it because of it being more prone to being hit while carrying it.

Q: 6. Is there any difference in image quality between an angled or straight viewing eye piece?

A: Hello, There is no difference in image quality, only in how you place your eye to look through the spotter. The straight eyepiece is coaxial with the field of view, so it's more intuitive, but the angled is more forgiving in field positions. Best Regards, David Eickelmann, Swarovski Optik North America.

Q: 7. Reviewer Cynthia said "and you can't carry it attached to your tripod like you can with other scopes". Is this true? I need a scope that I can carry on the tripod constantly, and weight is not an issue. Would this scope qualify for that? Thanks for any info you can provide.

A: The scope weigh is 3 lbs. without the eyepiece. You can leave it attached to the tripod but I would not recommend it. Makes it difficult to carry.

Q: 8. What size filter does the it take?

A: The millimeter size is 118mm The thread pitch is 0.75 B&H does not sell any 118mm filters.

Q: 9. What's the magnification with the ATX/STX and BTX eyepieces when used with the 115mm objective?

A: Good Afternoon, ATX/STX have a magnification range of 30-70x for the 115 objective lens module. BTX has a fixed 35x magnification for the 115mm objective lens module. Best Regards, David Eickelmann

Q: 10. Is there a adaptor to allow iPhone15 attach to Eyepiece Module for taking wildlife vedic?

A: The Swarovski BTX 30x/35x Eyepiece Module for ATX/STX Spotting Scopes can be used with this adapter to attach the iPhone 15 Pro Max: https://bhpho.to/3VrH7Jt