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Research draft

camera lens

vr.tr.camera-lens · PHY.OBJ

Let an agent explain camera lenses and their properties and types, support choosing and using lenses for photographic purposes, describe optical design and quality, and describe the history of lens design.

Thing Registry Physical world and living systems

Research draft, second pass

A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.

written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify

Researched by: Claude

Purpose and description

Let an agent explain camera lenses and their properties and types, support choosing and using lenses for photographic purposes, describe optical design and quality, and describe the history of lens design.

An optical assembly of one or more lens elements mounted in a barrel that forms an image on the sensor or film of a camera, characterised by focal length, maximum aperture, image circle and design type, including normal, wide-angle, long-focus and telephoto, macro, zoom and specialised lenses, historical designs such as the rapid rectilinear, and specific models from manufacturers; camera lenses determine perspective, depth of field and image quality and are interchangeable on many cameras.

What it is for: Optical assemblies forming camera images.

It can be explain properties and types; support choice and use; describe design and quality; describe history.

Distinguishing features

Focal length

Aperture

Design type

Mount compatibility

What it looks like

Cylindrical barrels with glass elements, rings and mounts.

How it is recognised

Forms an image on a camera sensor or film

Focal length, aperture, mount

A telescope views distant objects; a lens element is a single component

Related models

is a kind of - category

photo equipment

is a kind of - category

objective

is related to - users of lenses

photographer

is related to - lens resolving power

resolution

In practice

Families and kinds

normal and standard lenses

wide-angle lenses

long-focus and telephoto lenses

macro and specialised lenses

zoom lenses and historical designs

Standards and regulation

Lens mount standards

Optical testing conventions

No regulation of the device

Failure modes and hazards

Confusing focal length effects across sensor sizes

Damage from dust, fungus and impact

Counterfeit or misdescribed lenses

Also called

lens modelSigma 105mm F2.8 EX DG OS HSM MacroRectilinear lensRapid Rectilinearlong-focus lensAuto Yashinon-DS 50mm f1.9Samsung Galaxy S8 Rear CameraSamsung Galaxy S21 Rear Main CameraSamsung Galaxy S21 Rear Telephoto CameraSamsung Galaxy S21 Rear Wide Cameraautofocus driveLeica Noctilux-M 50mm f/0.95 ASPHfisheye lensPanavision lensessuper-wide lenscine lensZeiss Super Speed LensesZeiss Ultra Prime LensesAngénieux Optimo Prime Lens SeriesAngénieux Optimo Anamorphic lens seriesAngénieux Optimo Spherical lens seriesAngénieux Optimo Style Spherical lens seriesAngénieux Type EZ Lens SeriesAngenieux Optimo Anamorphic 56‑152 A2SAngenieux Optimo Anamorphic 30‑72 A2SAngenieux Optimo Anamorphic 42-420 A2SAngenieux Optimo Ultra Compact 21-56 FFAngenieux Optimo Ultra Compact 37-102 FFAngenieux Optimo Ultra 12x FF/VV, S35 & U35Angenieux Optimo 45‑120mm T2.8Angenieux Optimo 28‑76mm T2.6Angenieux Optimo 15-40mm T2.6Angenieux Optimo 19.5‑94mm T2.6Angenieux Optimo 24-290mm T2.8Angenieux Optimo Style 25‑250 - 10x Spherical Zoom LensAngenieux Optimo Style 48-130 - Lightweight Compact Mid-Range Tele ZoomAngenieux Optimo Style 30‑76 - Standard Compact Spherical Zoom LensAngenieux Type EZ-1 FF/VV & S35 (Standard)Angenieux Type EZ-2 FF/VV & S35 (Wide)Canon EF 70-300mm F4-5.6 IS USM

+788

Where this came from

wikidata · CC0 1.0

Source repository Registry entry point

Drafted structure

Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.

Understand What camera lenses are.

Optics.

Properties

Properties.

Properties

Properties.

  1. What do focal length, aperture, image circle and mount mean, and how do they affect images? definition
  2. Which sensor format is meant? boundary

Types

Types.

Types

Types.

  1. How do normal, wide-angle, telephoto, macro and zoom lenses differ in use? definition
  2. Which entry fits a specific lens type? action
Use Choosing and using.

Practice.

Choose

Choosing a lens.

Choose

Choosing.

  1. Which lens suits this photographic purpose, camera and budget? action
  2. Which entry fits a specific lens model? action

Technique

Technique.

Technique

Technique.

  1. How do aperture, focal length and focusing control depth of field and perspective? action
  2. Which entry fits photographic technique? action
Design Design and quality.

Engineering.

Design

Optical design.

Design

Design.

  1. How are lenses designed with elements, coatings and groups to control aberrations? provenance
  2. Which entry fits optical aberrations? action

Quality

Testing and care.

Quality

Quality.

  1. How is lens quality tested, and how are lenses cared for and repaired? provenance
  2. Which entry fits lens testing? action
Learn History and teaching.

Education.

History

History.

History

History.

  1. How did lens design develop from early achromats and the rapid rectilinear to modern computer-designed lenses? provenance
  2. Which references are standard? provenance

Teach

Teaching.

Teach

Teaching.

  1. How can lens optics be taught to photographers? action
  2. Which misconceptions arise? provenance

What the second pass must settle

  • Should each lens type be a separate entry?
  • How should lens databases be linked?
  • How should optical test resources be linked?
Draft as JSON