Swarovski BTX Eyepiece w/Tremor 4 Reticle 49904

Please Note: Subtension Accuracy with BTX Eyepiece & Tremor 4 Reticle

The Tremor 4 reticle is calibrated for use with the 95mm objective lens, ensuring precise MRAD subtension measurements

Using other objective lenses introduces measurement error:

• 115mm: ~1.6% error (Some may be ok with this small error for quick calls in the field)
• 85mm: ~18.7% error
• 65mm: ~19.4% error

When paired with the 1.7x magnification extender, these errors increase proportionally:

Example: 18.7% error becomes 31.8%

For optimal accuracy, use the BTX eyepiece with the 95mm objective, with or without the 1.7x extender.

Swarovski's new revolutionary BTX binocular spotting scope eyepiece brings unheard-of comfort to long range optical viewing. Compatible with all ATX/STX objective lenses, the BTX eyepiece module changes the way you'll think about spotting scopes.

BTX Features

• Perfect fit to SOC Objective modules - 65mm, 85mm, and 95mm objective modules are all supported
• Observer now can use both eyes all the time when scoping, enhancing user comfort and ergonomics and providing amazing image quality
• Does not have a zoom eyepiece
• Eyepieces are adjustable for interpupillary distance
• Right eyepiece adjusts for diopter
• Forehead rest provides enhanced user comfort and stability, and is adjustable for optimum viewing distance from ocular lenses
• Integrated peep sight for quickly finding remote targets
• SWAROVISION Field Flattener and High Definition Lenses give perfect clarity, eliminate distortion, offer increased eye relief, and bring out ulimate color contrasts
• SWAROTOP, SWARODUR, and SWAROCLEAN lens coatings
• Functional Temperature: -13° to 131° F

Note: Reticle appearance may vary slightly based on objective lens size.