Representing the largest objective option in their line of modular spotting scopes, the Swarovski Optik ATX/STX/BTX 115mm Objective Lens Module will accept any of the three available eyepiece modules: straight (STX) or angled-viewing (ATX), or the binocular viewer (BTX). The bayonet mount for the eyepiece modules is backward compatible with the original ATX/STX modules, to make it easy for users to upgrade their objectives without needing a new eyepiece module. This extra-large objective, versus the 65mm, 85mm, and 95mm models, draws in more light and produces a larger exit pupil to improve its low-light capabilities and make it an invaluable companion from the pre-dawn hours to all the way past dusk.

Optically, Swarovski combines the legendary image quality and world-class workmanship that nature enthusiasts, tactical professionals, and researchers have come to expect from the brand. The 115mm objective strikes a nice balance between light-gathering ability and portability, making it well suited for the hunter, outdoor enthusiast, or birder. Extra-low dispersion fluoride glass elements efficiently transmit all wavelengths of visible light, resulting in bright images that are color faithful, crisp, and rich with detail. An integrated field-flattener lens system corrects spherical aberrations to reveal crisp details at the edges of the view without distortion. SWARODUR and SWAROTOP coatings on all lenses and prisms minimize glare while maximizing contrast.

Complementing the optical performance and technologies is a lightweight and durable magnesium-alloy chassis that is wrapped in a protective rubber armor. Its optical tubes are nitrogen filled and O-ring sealed to be dustproof, waterproof and submersible, and resistant to internal fogging when moving through extreme temperature changes or environmental conditions. The tripod collar has a 1/4"-20 socket on the bottom of the Arca-Swiss-compatible shoe and a rotating collar to allow for precise eyepiece placement relative to the mounting system.

Eyepiece Module Required    Large 115mm Objective Lens    Field-Flattener Lens System    Extra-Low Dispersion Fluoride HD Glass    SWAROTOP and SWARODUR Coatings    Nitrogen Filled, Water and Fogproof    Durable and Lightweight Magnesium Body    Arca-Swiss-Compatible Tripod Shoe    Rotating Tripod Collar    Large Center-Focusing System

• Optional eyepiece module required: straight (STX) or angled (ATX) viewing and binocular viewer (BTX) available
• Extra-large 115mm objective lens draws in more light than all other modules and produces a large exit pupil for improved low-light performance
• Extra-low dispersion fluoride HD glass limits chromatic aberrations to produce clearer and sharper views with little or no color fringing
• Field-flattener lens system eliminates spherical aberrations to eliminate distortion at the edges of the field of view
• Anti-reflection SWAROTOP lens coatings reduce glare and improve contrast, color rendition, and clarity
• Scratch-resistant SWARODUR coatings protect exterior lens surfaces

• Large focusing collar is easy to manipulate even when wearing gloves
• Rotating tripod mount allow for precise eyepiece placement
• M118x0.75 objective lens threads allows the use of polarizing or neutral-density filters to improve the view in challenging conditions such as when using on or near water or in the snow
• Tripod shoe is compatible with Arca-Swiss quick release heads, so no additional plates or adapters are required
• Standard 1/4"-20 socket on bottom of shoe if needed

• Lightweight and impact-resistant magnesium-alloy housing
• Rubber armor protects against impacts while providing a slip-resistant grip for more secure handling during setup and breakdown
• SWAROCLEAN non-stick coating on exposed lens surfaces allows sap and oils to be easily cleaned for clearer views
• Nitrogen filled and O-ring sealed to be dustproof, waterproof/submersible to 13', and resistant to internal fogging when moving through extreme temperature changes or environmental conditions
• Broad -13 to 131°F operating temperature range

Related Questions and Answers

Q: 1. What is the field of view with the ATX 115 mm?

A: The field of view is the same as the 95mm 57 " to 104' at 1,000 yds.

Q: 2. 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

Q: 3. 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: 4. Is the optical quality superior to my current 30X70 zoom? I assume so since zooms usually are inferior. Tests? Proof of image quality over zoom? If used at night for astronomy, e.g., estimating magnitudes of variable stars, will the small 2.7 exit pupil be a negative to the point "not really usable at night sky"? What about splitting the light into the two barrels? Will this also be an issue of "not really meant for nighttime sky viewing"?

A: I own both the angled 30x70 zoom lens and the binocular BTX 35x eyepieces for my 90mm Swarovski modular spotting scope. Two me they are two different tools in the tool box. The 30x70 zoom eyepiece is ideal for scoping distant birds for bird watchers (which I am), especially for distant waterfowl on a lake as you pan the 180 degree vista in front of you. This combo is also ideal for watching shorebirds. You find the ducks at 30x and if you can’t identify them, you use the zoom feature. I use the binocular eyepiece for nest watching only these days, such as Bald Eagle and Osprey nests, or Purple Martin houses. With the binocular eyepiece, the whole unit is kind of heavy and bulky so you do not want to be lugging it too far in the field. I find the depth of field and, therefore, the focus, very sensitive with the binocular eyepiece. The binocular eyepiece is not the best choice if you are sharing the scope viewing experience with others because they will have to adjust the interpupilary distance of the two lenses and possibly the adjustable rings that aid in the distance your eyes are from the lenses. Optically, both lenses are mind-blowing! I have used the binocular eyepiece at night watching birds and bats fly silhouetted in front of the full moon. It was extremely sharp and bright. I am in my late 60s and have owned and used just about every make of scope. I am an Ornithologist so watch birds for a living, for citizen science, and for pleasure, and nothing can touch the quality of this scope for bird watching. I am sorry, for astronomical endeavors, I just don’t have the experience or expertise to answer your questions.

Q: 5. Will it work on a Swarovski 25-50x W eye piece on an STS 80 HD scope? If not, what is alternative?

A: No, only on Swarovski ATX & STX Scopes.

Q: 6. What is the filed of view at 1000 yards with the zoom ATX eyepiece and the 115mm objective lens at 30X and 70X magnification?

A: When using the Swarovski ATX Spotting Scope Modular Zoom Eyepiece (Angled Viewing) BH #SWATXMEA • MFR #49901 the Field of View With ATX-65, ATX-85 Scopes: 124 to 68' @ 1000 yd / 37.8 to 20.7 m @ 1000 m With ATX-95 Scopes: 104 to 57' @ 1000 yd / 31.7 to 17.4 m @ 1000 m

Q: 7. 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: 8. Does it work with the STM 80 or the ATM 80

A: The Eye Cup for ATX/STX will not work with an ATM/STM spotter. Assuming you have a 20-60 or 25-50 Wide Angle Eyepiece, you'll need our item 44089. This can be found by searching the B&H page for "Swarovski Optik 44089".

Q: 9. does it work with Leica 25-50 ww asph?

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

Q: 10. Instructions, please. How do you insert the tab?

A: The instructions for replacement the lens cap can be found on page 4 of this user manual for the binoculars: https://bhpho.to/48Kr2Ss