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  • Home
  • Glossary
    • Glossary: A-B
      • Abbe-Method
      • Abbe-number
      • Airy-Disk
      • angular
      • Aperture angle
      • aperture value
      • back focal length
      • Barrel Distortion
      • Bayer Pattern
      • best form lens
      • BFL
      • Binary Image
      • Blue Shift of Bandpass Filters
      • Bokeh
  • Blog
    • Can I increase the DOF by changing the focal length, if FOV and brightness are constant?
    • Little siblings: s-Mount lenses as replacement for c-mount lenses
    • Comparison: c-mount lenses vs. s-mount lenses (M12x0.5)
  • Book
    • Chapter 01: Introduction
    • Chapter 02: Basics
    • Chapter 03: Hostile Brothers – incompatible properties of lenses
    • Chapter 04: Dangerous Half Knowledge
  • FAQ
    • FAQ : Objectives
      • Why do we use the focal length to describe a lens and not the viewing angle?
      • What’s the difference between zoom lenses and vario lenses?
      • How to tell which sensor size a zoom lens was designed for?
      • Can s-mount lenses replace c-mount lenses in general?
      • Can s-mount lenses be as good as c-mount lenses?
      • What are the features of rear converters?
      • What is the CRA (chief ray angle)?
    • FAQ: Practice
      • How to calculate the length of needed distance rings?
      • How to focus a lens at two distances at once?
      • How to determine the focal length that results in a 1:1 mapping?
    • FAQ: Resolution
      • How to read an USAF1951 target?
      • Why can color cameras use lower resolution lenses than monochrome cameras?
    • FAQ: Conversion
      • How to convert diopters to focal length?
      • How to convert focal length to diopters?
      • How to convert pixel size to line pairs per millimeter?
      • How to convert line pairs per millimeter to pixel size?
      • How to convert Numerical Aperture to F-Number?
      • How to convert optical inches to image circle diameter?
      • How to convert pixel count and size to Inches?
    • FAQ: Geometrical Optic
      • How to determine the position of the image of an object point?
      • How to tell whether a lens singlet is converging or diverging?
  • Trouble Shooting
    • Symptom: Colors different on left and right side
    • Symptom: Field Of View changes from lens to lens
    • Symptom: I can’t focus my lens to infinity
    • Symptom: Image is darker at the Rim of Bandpass Filters
    • How to convert pixel size to line pairs per millimeter?
    • Symptom: Low Contrast when using Telecentric Lenses of Coax Type
    • Symptom: Pink Image
    • Symptom: Purple rim around dark objects
    • Symptom: Unsymmetrical Image Brightness
  • Calculators

FAQ: Practice

  • How to calculate the length of needed distance rings?
  • How to focus a lens at two distances at once?
  • How to determine the focal length that results in a 1:1 mapping?

Recent Posts

  • What happens when you focus lenses from infinity to shorter distances?
  • What’s the relationship between the main features of a lens?
  • About the Sense and Nonsense of Resolution
  • Why Megapixel? Lenses don’t have a Pixel-Structure after all!
  • Can I increase the DOF by changing the focal length, if FOV and brightness are constant?

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