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Representing the latest advancement in Night Vision Optics, the ATN PS40-WPT gives your Daytime Scope Night Vision capability in a matter of seconds. The ATN PS40-WPT mounts in front of a Daytime Scope to enable nighttime operation. No shift of impact, no need to rezero nor change of eye relief occurs. The ATN PS40-WPT uses the latest in image intensifier tube technology for outstanding resolution and performance. Precision optical alignment is essential for a Front Sight System to work properly. This is why each ATN PS40-WPT is individually tested and aligned on an optical scale by our engineers to provide perfect alignment. The ATN PS40-WPT is one of the most compact and lightweight NV systems in its class, at only 840 grams. Features: - Easily changes daytime scope to Night Vision - Mounts in front of daytime scope, no re-zeroing required - Multi-coated all-glass optics - Fast catadioptic front lens system - Equipped with remote control - Powered by a single alkaline AA or 123A lithium battery - Battery life check system - Large 40mm eyepiece/output window - Included Quick Release Mount - Optional Scope Mounting System for coupling to the objective of the day scope (47...58,7 mm diameter) - Automatic Brightness Control - Bright Light Cut-off System - Resistance to severe conditions Specifications: - Total Darkness IR System: No - "SMART" Technology: No - IIT Generation: WPT - Photocathode Type: Multi - Alkali - Resolution: 60-74 lp/mm - Signal to noise, minimum: 18-26 - MTTF (Mean Time Before Failure): 10,000 hours - Magnification: 1x - Lens System: F1.44, 80mm - Proshield Lens Coating: Yes - FOV: 12 - Exit Pupil: 40mm - Range of Focus: 10 m to infinity - Diopter Adjustment: No - Controls: Direct -  Remote Control: Yes - Automatic Brightness Control: Yes - Bright Light Cut-off: Yes - Infrared Illuminator: No - IR Indicator: No - Low Battery Indicator: Yes - Power Supply: 1x1.5 V AA type battery or 1x3 V CR123A type battery - Battery Life: 50 hours ( 3 V ) / 25 hours (1. 5 V ) - Reticle System: No - Windage & Elevation Adjustment: No - Environmental Rating: Waterproof - MIL-STD-810: Yes - Operating Temperature: -20 to +50 C - Storage Temperature: -50 to +50 C - Dimensions: 177 x 85 x 83 mm / 7.0" x 3.4" x 3.3" - Weight: 0.84 kg / 1.85 lbs