Optics
   
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  aberration : An optical lens defect that prevents lig... (more)
  achromatic : The view through an optical device, such... (more)
  achromatic lens : A lens consisting of two joined glass pa... (more)
  adjust : To alter in order to achieve a certain g... (more)
  adjustable objective : Feature on a scope that allows for paral... (more)
  ametropic : Visual imparement resulting from faulty ... (more)
  anastigmat : Compound lens or lens system designed to... (more)
  angular magnification : An increase in the perceived size of a s... (more)
  aplanatic objective : Objective lense free from or corrected f... (more)
  astigmatic aberration : Aberration due to the irregular curvatur... (more)
  astigmatism : A visual defect in which the unequal cur... (more)
  axis of lens : The central alignment of a series of len... (more)
  azimuth difference : See: parallax
  base shims : Shims placed under scope or sight bases ... (more)
  bell : 1. To bell a case mouth means to slightl... (more)
  bell diameter : The diameter of the portion of a scope t... (more)
  binoculars : A magnifying optical instrument designed... (more)
  blackout : Condition where the exit pupil of a scop... (more)
  bore sighting : Sighting through the bore of a gun to al... (more)
  bridge mount : 1. For pistols, a bridge mount secures t... (more)
  brightness : A shooter's perceived picture clarity th... (more)
  bullet drop compensator : Device found in scopes used by the shoot... (more)
  cementing lenses : The joining of two lenses within a scope... (more)
  claw mount : A quick-detachable scope mounting system... (more)
  click : The unit of measurement used to describe... (more)
  coated lens : See: coated optics
  coated optics : Optical equipment, such as scopes, that ... (more)
  coin slot knobs : Elevation and windage adjustment posts f... (more)
  collimator : In shooting, an optical device used to r... (more)
  crosshair reticle : A scope or sight aiming device consistin... (more)
  diffraction : The distortion of light ray's as they en... (more)
  diopter : The number used to denote the magnificat... (more)
  distortion : A bending of light waves entering an opt... (more)
  dot reticle : An optical reticle that is a circular po... (more)
  dovetail rings : Scope rings which incorporate an integra... (more)
  drilling and tapping : The gunsmithing process of making and th... (more)
  duplex reticle : A widely used scope reticle developed by... (more)
  electronic sight : An optical device that provides an elect... (more)
  elevation adjustment : The vertical movement of iron sights or ... (more)
  elevation knob : A rotating knob on a scope or sight used... (more)
  entrance pupil : See: objective lens
  erecting system : The lens system of an optical device, su... (more)
  erector lens : See: erecting system
  exit pupil : In relation to scopes, the exit pupil is... (more)
  extended eye relief : The distance (normally 4+ inches) the ey... (more)
  extension rings : Scope mounting devices that have the rin... (more)
  external adjustment scope : A scope that requires the changing the p... (more)
  eye relief : The distance the eye must be held from t... (more)
  eyepiece : See: ocular lens
  field of view : The full measure of the picture visible ... (more)
  fixed power scope : A scope which has only one specific powe... (more)
  flare : Random light rays entering a scope that ... (more)
  focus : 1. Concentration, such as needed for acc... (more)
  folding sight : A auxiliary rear iron sight that can be ... (more)
  frog mount : A style of detachable scope rings that u... (more)
  front objective : See: objective lens
  gas-filled scope : A term used to denote a scope interior t... (more)
  gas-sealed : See: gas-filled scope
  glassing : A colloquial term for the use of an opti... (more)
  graticule : See: reticle
  hunting scope : Any type of scope specifically designed ... (more)
  illuminated reticle : A scope reticle that uses either a light... (more)
  illuminated scope : See: illuminated reticle, night vision
  image : The view through a scope.
  infinity : A scope or binocular setting in which th... (more)
  internal adjustment graduation : The outside markings and notches that ma... (more)
  internal adjustment scope : A scope that requires a change in the po... (more)
  internal fogging : The build-up of moisture on the inside s... (more)
  laser sight : A firearm-mounted sighting system that s... (more)
  lens : The transparent concave or convex glass ... (more)
  lens cap : A cover used to protect the ocular and o... (more)
  lens coating : See: coated optics
  light collector : A port or tube of luminate material desi... (more)
  light gathering power : The ability of an optics system to trans... (more)
  light transmission : The percentage of light rays that pass t... (more)
  magnesium fluoride : A thin, colorless material used to provi... (more)
  magnifying power : The number of times larger a picture app... (more)
  Malcom scope : A series of rifle scopes manufactured in... (more)
  maximum internal adjustment : The most amount of adjustment to a scope... (more)
  micrometer adjustment : A general term referring to the fine cor... (more)
  micrometer telescope mount : See: external adjustment scope
  mil : 'Mil' is the shortened form of millradia... (more)
  mil-dot reticle : A range-estimating reticle originally de... (more)
  minimum focus distance : The shortest distance at which a scope c... (more)
  mirage : An optical distortion due to rising heat... (more)
  monocular : An optical device with only a single vie... (more)
  mount adapter : Any type of attachment device that allow... (more)
  mounting length : The maximum length of a scope's tube to ... (more)
  multi-coated lens : See: coated optics
  night vision : A scope, binocular or monocular designed... (more)
  nitrogen filled : See: gas-filled scope
  objective bell : See: objective end
  objective end : The portion of a scope tube that is poin... (more)
  objective lens : The lens in the objective end of a scope... (more)
  ocular bell : See: ocular end
  ocular end : The housing cover of the ocular lens of ... (more)
  ocular lens : The last lens of a scope; the lens that ... (more)
  offset mount : A scope mounting system in which the sco... (more)
  one-piece base : A scope mounting system in which the sco... (more)
  one-piece mount : See: one-piece base
  optical sight : A sighting device that utilizes lenses, ... (more)
  optics : See: optical sight
  parallax : The improper focus of the reticle in rel... (more)
  parallax correction : Moving the objective lens forward or bac... (more)
  phase correction coating : A chemical coating used on the top porti... (more)
  picatinny rail : A term for a mounting rail system for sm... (more)
  plex : See: duplex reticle
  point of aim : 1. That point which a firearm's sights a... (more)
  point of aim shift : A condition associated with variable pow... (more)
  post crosshair : See: post reticle
  post reticle : A scope reticle that consists of a thin,... (more)
  power : The degree of magnification of an optica... (more)
  prism : A transparent piece of glass that refrac... (more)
  prismatic : Optical equipment that uses a system of ... (more)
  rail scope mounting system : A type of scope popularized in Europe th... (more)
  rangefinder laser : A sighting tool used to determine the ra... (more)
  rangefinder scope : A scope that utilizes either a laser ran... (more)
  rangefinding reticle : A scope reticle that contains either two... (more)
  rear eyepiece : See: ocular lens, rear sight
  red dot sight : An optical sighting device that forms a ... (more)
  relative brightness : A measurement of a scope's ability to pr... (more)
  resolution : The degree of image definition and clari... (more)
  resolving power : See: resolution
  reticle : A one dimensional sighting device found ... (more)
  reticle subtension : Most commonly expressed in inches per 10... (more)
  reticule : See: reticle
  riflescope : See: scope
  ring alignment rods : Cylinders, normally made of metal, that ... (more)
  rings : See: scope rings
  scope : An optical sighting device used to magni... (more)
  scope base : The part of a scope assembly to which th... (more)
  scope caps : Plastic or metal covers for the ocular a... (more)
  scope cover : A leather, cloth or polymer protective s... (more)
  scope height : The vertical distance between the bore l... (more)
  scope mount : See: scope base
  scope mount wrenches : Any type of wrench used to properly secu... (more)
  scope mounting height : The desired scope mounting height in mos... (more)
  scope mounting jig : Gunsmithing device that locks down the r... (more)
  scope rings : Metallic clamps that hold a scope onto a... (more)
  scope shims : Small metal tabs used to make minute adj... (more)
  scope sight : See: scope
  scope stud : A small projection from the barrel, rib,... (more)
  scope wrench : Any type of wrench used to adjust a scop... (more)
  screw plug : A small screw used to fill in an unused ... (more)
  see-thru ring mount : A type of scope ring that has a gap betw... (more)
  shim : A piece of thin material used to fill or... (more)
  side mount scope base : A scope mount that is mounted to the ver... (more)
  sight backlash : The effect of recoil on the position of ... (more)
  sight picture : Whatever the shooter sees when aiming an... (more)
  sight-in angle : The angle of the bore in relation to the... (more)
  sight-in range : The distance at which a shooter has set ... (more)
  sleeved action : A receiver and barrel free floating in a... (more)
  sniperscope : 1. A military term for a night-vision ca... (more)
  spotting scope : A base mounted telescope used for findin... (more)
  spud : A rod that slides into the bore and hold... (more)
  stadia wire : A type of reticle material that is of a ... (more)
  Starlight scope : An early night vision scope first utiliz... (more)
  stock crawler : A shooter who erroneously moves his face... (more)
  strain gage : A chamber pressure measuring device that... (more)
  swivel mount : A type of scope ring and base system in ... (more)
  target scope : A large ocular diameter, high magnificat... (more)
  telescope mount : See: scope base
  telescope sight : See: scope
  tip-off ring mount system : A general term used to describe scope ri... (more)
  torx : A type of screw head shaped like a six-p... (more)
  transducer : Device used to obtain chamber pressure e... (more)
  tritium : Tritium is a radioactive isotope of hydr... (more)
  tunnel mount : A scope mount system that is raised abov... (more)
  turret knob : A rotating knob on a scope or sight used... (more)
  two-piece mount : A scope mount system that has two bases ... (more)
  variable power scope : A firearm scope that can be adjusted thr... (more)
  vignetting : The blurring of the edges of an optical ... (more)
  W&E : Abbreviation for 'windage and elevation'... (more)
  windage : 1.The lateral movement of a sight or sco... (more)
  windage adjustment : The alteration of the horizontal setting... (more)
  windage knob : A turret knob on a scope or sight used t... (more)
  zero : The settings of elevation and windage of... (more)
  zero range : The distance at which a sight or scope's... (more)
  zero sight adjustment : Altering the elevation and/or windage of... (more)
  zoom spotting scope : A spotting scope that has different powe... (more)
  wide angle optics : Optical devices such as rifle scopes in ... (more)
  windage base : A type of scope base used on firearms in... (more)
  weaver-style : A term for a mounting rail system for sm... (more)
  mil dot : See: mil-dot reticle
  mildot : See: mil-dot reticle