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Reticle accessory (PD-8) used in sniper rifles. A reticle, or reticule[1][2] also known as a graticule, is a pattern of fine lines or markings built into the eyepiece of an optical device such as a telescopic sight, spotting scope, theodolite, optical microscope or the screen of an oscilloscope, to provide measurement references during visual ...
1981: Pentax was the first to create an TTL-autofocus camera and started the development of autofocus systems. That camera was the Pentax ME-F. [6] 1984: Pentax introduces the Pentax 645 SLR medium format system. 1991: Pentax was the first to introduce Power Zoom on bayonet mount lenses for SLR cameras. That lenses included the FA* 250-600mm f5 ...
Snellen chart. Purpose. Snellen chart is used to estimate visual acuity (last three rows are 20/15, 20/13 and 20/10) A Snellen chart is an eye chart that can be used to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862 as a measurement tool for the acuity formula ...
Pentax 02 Standard Zoom (2011) — 28–80 mm equivalent; Pentax 03 Fisheye (2011) — 17.5 mm equivalent; Pentax 04 Toy Lens Wide (2011) — 35 mm equivalent; Pentax 05 Toy Lens Telephoto (2011) — 100 mm equivalent; Pentax 06 Telephoto Zoom (announced in 2012) — 83–249 mm equivalent; Pentax Adapter Q for K-Mount Lens (announced in 2012)
Ballistic sunglasses or prescription eyeglasses must meet the same requirements. In brief, the U.S. military standard requires that ballistic eyewear must be able to withstand up to a 3.8 mm (.15 caliber) projectile at 195 m/s (640 ft/s)) for spectacles and 5.6 mm (.22 caliber) projectile at 168–171 m/s (550–560 ft/s) for goggles.
The Pentax K1000 (originally marked the Asahi Pentax K1000) is an interchangeable lens, 35 mm film, single-lens reflex (SLR) camera, manufactured by Asahi Optical Co., Ltd. from 1976 to 1997, originally in Japan. [1][2] The K1000's extraordinary longevity makes it a historically significant camera. The K1000's inexpensive simplicity was a great ...
The Integrated Helmet and Display Sight System (IHADSS) 30 mm M230 chain gun turret on a Boeing AH-64 Apache being aimed with a helmet-mounted sight. A helmet-mounted display (HMD) is a headworn device that uses displays and optics to project imagery and/or symbology to the eyes. [1][2][3] It provides visual information to the user where head ...
A telescopic sight, commonly called a scope informally, is an optical sighting device based on a refracting telescope. [1] It is equipped with some form of a referencing pattern – known as a reticle – mounted in a focally appropriate position in its optical system to provide an accurate point of aim.