Dialyte lens

A biconvex lens

Compound lens design that corrects optical aberrations where the lens elements are widely air-spaced.

- Dialyte lens
A biconvex lens

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A 150 mm aperture catadioptric Maksutov telescope

Catadioptric system

One where refraction and reflection are combined in an optical system, usually via lenses and curved mirrors (catoptrics).

One where refraction and reflection are combined in an optical system, usually via lenses and curved mirrors (catoptrics).

A 150 mm aperture catadioptric Maksutov telescope
Light path in a Schmidt–Cassegrain
Light path in a meniscus telescope (Maksutov–Cassegrain)
Houghton doublet corrector design equations – special case symmetric design.
Light path in an Argunov Cassegrain telescope
Example of a catadioptric lens using rear surfaced "mangin mirrors" (Minolta RF Rokkor-X 250mm f/5.6)
An example of 'iris blur' or bokeh produced by a catadioptric lens, behind an in-focus light.
500 mm catadioptric lens mounted on a Yashica FX-3
Minolta AF 500 mm F/8 catadioptric lens mounted on a Sony Alpha 55 camera
Samyang 500mm f/8

Catadioptric dialytes are the earliest type of catadioptric telescope.

Chromatic aberration of a single lens causes different wavelengths of light to have differing focal lengths.

Achromatic lens

Lens that is designed to limit the effects of chromatic and spherical aberration.

Lens that is designed to limit the effects of chromatic and spherical aberration.

Chromatic aberration of a single lens causes different wavelengths of light to have differing focal lengths.
An achromatic doublet brings red and blue light to the same focus, and is the earliest example of an achromatic lens.
In an achromatic lens, two wavelengths are brought into the same focus, here red and blue.

Dialyte lenses have a wide air space between the two elements.

John Wall

John Wall (inventor)

English design engineer, amateur astronomer, amateur telescope maker and member of the British Astronomical Association.

English design engineer, amateur astronomer, amateur telescope maker and member of the British Astronomical Association.

John Wall
Drawings for the Crayford focuser
30-inch dialyte refracting telescope

He is also known for designing dialyte based refracting telescopes, coming up with the Zerochromat retrofocally corrected refractor, including a folded 30-inch f/12 version he built in 1999.

Different kinds of camera lenses, including wide angle, telephoto and speciality

Celor lens

Different kinds of camera lenses, including wide angle, telephoto and speciality

A Celor lens (also known as a symmetric dialyte) is a highly corrected lens of the Dialyt type, designed for process photography, involving reproduction at or near 1:1 scale.

An achromatic doublet

Doublet (lens)

Type of lens made up of two simple lenses paired together.

Type of lens made up of two simple lenses paired together.

An achromatic doublet
An old Carl Zeiss Tessar camera lens with four elements, comprising two doublets. The front doublet is air-gapped and divergent; the rear doublet is glued and convergent. This arrangement was better at correcting spherical and chromatic aberrations and astigmatism than previous lens designs.

A sub-type of air-spaced doublet is the dialyte, a design where elements are widely spaced to save on the amount of glass used or where the elements cannot be cemented because they have strongly dissimilar curvatures.

Joseph Petzval

Mathematician, inventor, and physicist best known for his work in optics.

Mathematician, inventor, and physicist best known for his work in optics.

Joseph Petzval's grave
Diagram of Petzval's 1841 portrait lens - crown glass shaded pink, flint glass shaded blue
Petzval lenses
Modern Petzval objective lenses from a projector

The latter's lenses were marketed in Austria as the "photographic Dialyt", while Voigtländer marketed the lenses in Germany and Austria as the "Voightländer Orthoskop".

A biconvex lens

List of lens designs

This list covers optical lens designs grouped by tasks or overall type.

This list covers optical lens designs grouped by tasks or overall type.

A biconvex lens

Dialyte lens

A 200 mm refracting telescope at the Poznań Observatory

Refracting telescope

Type of optical telescope that uses a lens as its objective to form an image (also referred to a dioptric telescope).

Type of optical telescope that uses a lens as its objective to form an image (also referred to a dioptric telescope).

A 200 mm refracting telescope at the Poznań Observatory
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Optical diagram of Galilean telescope
y – Distant object; y′ – Real image from objective; y″ – Magnified virtual image from eyepiece;
D – Entrance pupil diameter; d – Virtual exit pupil diameter;  L1 – Objective lens;  L2 – Eyepiece lens e – Virtual exit pupil – Telescope equals
Engraved illustration of a 150 ft focal length Keplerian astronomical refracting telescope built by Johannes Hevelius.
Alvan Clark polishes the big Yerkes achromatic objective lens, over 1 meter across, in 1896.
This 12 inch refractor is mounted in dome and a mount the rotates with the turn of the Earth
The Greenwich 28-inch refractor is a popular tourist attraction in 21st century London
The Apochromatic lens usually comprises three elements that bring light of three different frequencies to a common focus
The 102 cm refractor, at Yerkes Observatory, the largest achromatic refractor ever put into astronomical use (photo taken on 6 May 1921, as Einstein was visiting)
The "Große Refraktor" a double telescope with a 80cm (31.5") and 50 cm (19.5") lenses, was used to discover calcium as an interstellar medium in 1904.
Astronaut trains with camera with large lens
Touristic telescope pointed to Matterhorn in Switzerland
The Yerkes Great refractor mounted at the 1893 World's Fair in Chicago; the tallest, longest, and biggest aperture refactor up to that time.
The 68 cm refractor at the Vienna University Observatory

John Wall (30 in) dialyte refracting telescope - the largest refractor built by an individual, at Hanwell Community Observatory