lumina·optics

Interactive optical study

One beam,
bent honestly

Move the prism to compare how refractive index and dispersion redirect one beam. This view illustrates an optical model; it is not a measured photograph, a product specification, or a lab result.

Illustrative glass prism on a dark optical surface splitting one collimated beam into a spectrum
Illustrative lens cutaway: a stack of glass elements in a metal barrel, edge-lit to show refraction paths
L-85 concept cutaway · illustrative element layout

Glass sets
the light path

A lens is a chain of refractions: every surface bends the path before an image is made. The L-85 concept uses low-dispersion elements to explain why a design can keep colours from spreading across the frame.

The cutaway is a constructed reference image. Its element count and spacing are illustrative, not a measurement of a commercial lens.

MTF, read with conditions

Contrast transfer at stated line pairs per millimetre gives a clearer comparison than a slogan. These curves illustrate the labels a measured chart needs; they are not optical-bench results.

  • 10 lp/mm · sagittal
  • 10 lp/mm · meridional
  • 30 lp/mm · sagittal
  • 30 lp/mm · meridional
1.0 0.75 0.5 0.25 center image field (mm) corner 21.6
L-85 concept · f/1.8 · infinity focus · illustrative curve

Reference specification

L-85 concept specification — illustrative item, value, and condition
Item Illustrative value Condition
Focal length85 mmconcept reference
Aperturef/1.8 – f/16concept reference
Elements7 in 6illustrative layout
Close focus0.62 millustrative configuration
FilterØ 62 mmillustrative configuration
Weight438 gillustrative configuration

About this study

This is a concept page for reading an optical model. It does not schedule sample loans, measurements, or MTF requests.

Return to the light study