Leica 2.5-10x42 ERi Riflescope (4A)

Leica 2.5-10x42 ERi Riflescope (4A)

Leica 2.5-10x42 ERi Riflescope (4A)

B&H # LE2510X42ARS MFR # 55020

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Product Highlights

  • Illuminated 4A Reticle, 2nd Plane
  • 30mm Main Tube Diameter
  • 0.1 mil Impact Point Correction
  • Low-Profile Capped Turrets
  • Nitrogen-Filled Fogproof / Waterproof
  • Parallax-Free at 109 yd
  • Aluminum Housing
  • Tilt-Sensing Auto-Off Function
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Leica 55020 overview

  • 1Description

The 2.5-10x42 ERi Riflescope from Leica fuses a weather-sealed housing and high-transmission lens system with a range of shooter-friendly features that help make this optic well-suited for close and mid-range targeting. Leica employs a 30mm optical path and multicoated lenses to transmit a clear image that has crisp detail and impressive brightness even during twilight hours. Complementing its optical performance, the ERi has a 4" eye relief and a 2.5-10x zoom range, making the ERi both versatile and practical.

This ERi riflescope model is configured with Leica's illuminated 4A reticle, a general purpose pattern that has a fine crosshair centered on three medium-weight posts at three, six, and nine o'clock. The 2.5-10x42 ERi also has low-profile capped windage and elevation turrets that make impact point corrections in 0.1 mil increments. Leica's reticle illumination system has nine brightness settings controlled by a dedicated side turret.

To preserve battery life, the ERi features two automatic deactivation functions; one that turns off the illuminated aiming point after three minutes, the other uses a built-in sensor to determine when the rifle-mounted scope is raised or lowered from the firing position. Once the rifle is returned to a relatively level position (±70°), the red dot is immediately re-activated to the previously used brightness setting.

In addition to the image quality and functionality of the ERi riflescope, its nitrogen-filled aluminum housing is built for reliable performance in heavy rain, extreme humidity, and rapid temperature changes. Exposed lens surfaces are coated with AquaDura, a water-repellent layer that helps moisture roll off the lens surface and prevent occluding the scope's objective or eyepiece.

Optical Performance
  • 2.5-10x magnification
  • 42mm objective
  • 4" eye relief
  • German 4A reticle in 2nd plane
Use and Handling
  • 0.1 mil impact point correction
  • Low-profile capped windage and elevation turrets
  • Auto-Off function disables illuminator when tilted beyond ±70°
  • Dedicated reticle illumination turret
  • 9 reticle brightness levels


Construction Details
  • 30mm tube diameter, aluminum construction
  • Nitrogen-filled fogproof and waterproof
  • AquaDura moisture-repellant lens coating
  • Knurled windage / elevation adjustment dials
  • 12.75" length
  • 18.3 oz weight
In the Box
Leica 2.5-10x42 ERi Riflescope (4A)
  • Lens Cover Set
  • Lens Cloth
  • Limited Lifetime Warranty
  • Table of Contents
    • 1Description

    Leica 55020 specs

    Magnification 2.5 - 10.0x
    Objective Lens Diameter 42 mm
    Main-Tube Diameter 1.2" (30 mm)
    Reticle Illuminated 4A
    Field of View 44 - 12 ft (13.4 - 3.7 m) at 100 yd
    Parallax Correction 109 yd (100 m)
    Eye Relief 4" (100 mm)
    Exit Pupil Diameter 14 - 4.2 mm
    Diopter Adjustment -4 to 3
    Filter Size M 46 x 0.75 mm
    Impact Point Correction 0.1 mil
    Maximum Windage/Elevation Adjustment Not specified by manufacturer
    Weatherproofing Nitrogen-filled
    Watertight 13 ft (4 m)
    Power Supply (1) 2032 battery
    Runtime Not specified by manufacturer
    Dimensions 12.75" (32 cm)
    Weight 18.3 oz (520 g)

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