Assemble optical instruments, such as telescopes, level-transits, and gunsights.

Cement multiple lens assemblies together. Clean elements and parts, using tissue, cleaning solutions, and air compressors. Coat optical elements according to specifications, using coating equipment. Fill instrument housings with nitrogen gas in order to minimize corrosive effects on internal optical surfaces, using vacuum pumps. Grind and polish optics, using hand tools and polishing cloths. Insert and screw locking rings into housings in order to hold elements in place; apply cement to locking rings in order to prevent loosening. Measure and mark dimensions and reference points, and lay out stock for machining. Measure elements and instrument parts in order to verify dimensional specifications, using precision measuring instruments. Mix holding compounds, and mount workpieces or optical elements on holding fixtures. Pick up elements, using vacuum-holding devices, and position elements in mounting seats of instrument housings. Position targets in darkroom tunnels, and connect optical instruments to test devices, such as oscilloscopes and collimators. Set up and operate machines in order to assemble structural, mechanical, and optical parts of instruments. Sight instruments on targets, and read dials in order to determine optical centers of instrument lenses and to verify compliance to focusing power specifications. Study work orders, blueprints, and sketches in order to formulate plans and sequences for fabricating optical elements, instruments, and systems. Compute sighting instrument distances, using trigonometric formulas. Paint parts, using brushes and spray guns. Record production, inspection, and test data in logs.

Physics -- Knowledge and prediction of physical principles, laws, their interrelationships, and applications to understanding fluid, material, and atmospheric dynamics, and mechanical, electrical, atomic and sub- atomic structures and processes. Mathematics -- Knowledge of arithmetic, algebra, geometry, calculus, statistics, and their applications. Mechanical -- Knowledge of machines and tools, including their designs, uses, repair, and maintenance. Production and Processing -- Knowledge of raw materials, production processes, quality control, costs, and other techniques for maximizing the effective manufacture and distribution of goods.

Equipment Selection -- Determining the kind of tools and equipment needed to do a job. Mathematics -- Using mathematics to solve problems. Operation and Control -- Controlling operations of equipment or systems. Reading Comprehension -- Understanding written sentences and paragraphs in work related documents. Operation Monitoring -- Watching gauges, dials, or other indicators to make sure a machine is working properly. Critical Thinking -- Using logic and reasoning to identify the strengths and weaknesses of alternative solutions, conclusions or approaches to problems. Science -- Using scientific rules and methods to solve problems. Quality Control Analysis -- Conducting tests and inspections of products, services, or processes to evaluate quality or performance.

Arm-Hand Steadiness -- The ability to keep your hand and arm steady while moving your arm or while holding your arm and hand in one position. Manual Dexterity -- The ability to quickly move your hand, your hand together with your arm, or your two hands to grasp, manipulate, or assemble objects. Near Vision -- The ability to see details at close range (within a few feet of the observer). Control Precision -- The ability to quickly and repeatedly adjust the controls of a machine or a vehicle to exact positions. Finger Dexterity -- The ability to make precisely coordinated movements of the fingers of one or both hands to grasp, manipulate, or assemble very small objects. Information Ordering -- The ability to arrange things or actions in a certain order or pattern according to a specific rule or set of rules (e.g., patterns of numbers, letters, words, pictures, mathematical operations). Problem Sensitivity -- The ability to tell when something is wrong or is likely to go wrong. It does not involve solving the problem, only recognizing there is a problem. Written Comprehension -- The ability to read and understand information and ideas presented in writing. Wrist-Finger Speed -- The ability to make fast, simple, repeated movements of the fingers, hands, and wrists. Number Facility -- The ability to add, subtract, multiply, or divide quickly and correctly.

Controlling Machines and Processes -- Using either control mechanisms or direct physical activity to operate machines or processes (not including computers or vehicles). Handling and Moving Objects -- Using hands and arms in handling, installing, positioning, and moving materials, and manipulating things. Getting Information -- Observing, receiving, and otherwise obtaining information from all relevant sources. Inspecting Equipment, Structures, or Material -- Inspecting equipment, structures, or materials to identify the cause of errors or other problems or defects. Monitor Processes, Materials, or Surroundings -- Monitoring and reviewing information from materials, events, or the environment, to detect or assess problems.