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iris

iris

15 7.1
A ring of thin plates that opens and closes to control light entering a lens
  • noun
  • /ˈaɪrɪs/
  • Specialized
translation icon : diafragma
  • Some units also provide an iris and filter mount package for control of color temperature.
  • camera iris
  • open the iris
  • close the iris

But Maker's Cabinet has updated their iris and they sent me another one of those too.

Examples

  • All iris controls are on the camera.

    Blog text (26)
  • Abbe condenser with an iris diaphragm and a mechanical stage with a 140 x 135 mm surface area.

    Academic text (2002)
  • That is fine. You forgot the iris control on the side grip of the handle.

    Blog text (26)
  • It is a circular center 14-blade iris, which should make for some very interesting and soft effects.

    Blog text (13)
  • Both the RED Epic and Canon DSLRs change the iris in 1/3 stop increments.

    Blog text (26)
  • The C300 has a feature called "fine iris" which I played with and was able to get much finer increments than the 1/3 stop (there is also a 1/2 stop one).

    Blog text (26)
  • Thus, a 50mm lens with an iris diameter of 25mm has an aperture of 50/25 = f2.0.

    Blog text (18)
  • The photographer adjusted the iris of the camera to let in more light for the shot.

  • In microscopes, the iris helps to control the amount of light that illuminates the specimen.

  • To achieve the best exposure, it is important to set the iris correctly before taking the picture.

Synonyms

iris diaphragm
vsiris
  • Specialized
7.6

A part with thin overlapping plates that controls how much light passes through a lens

is the common shorter name for the same plate device
diaphragm
vsiris
  • Specialized
7.1

A part inside a camera that opens or closes to control the amount of light

is made of thin overlapping plates to adjust a central opening
paraphragm
vsiris
  • Specialized
9.9

An adjustable opening in a camera lens that controls how much light enters

is the physical plate mechanism rather than the opening itself

Compounds

1 6.5

A garden iris with soft hairs on its lower petals

iris scanning
  • Specialized
1 6.0

A way to check who someone is by looking at the coloured part of their eye

beardless iris
  • Specialized
8.4

An iris plant with no hairs on the lower drooping parts of the flower

bulbous iris
  • Specialized
7.1

A flowering plant that grows from a bulb and makes bright flowers in spring

A flowering plant with pale purple flowers from Dalmatia

6.3

A low-growing iris plant with small, colorful flowers

A spring flower with blue or purple petals people grow in gardens and use in bouquets

A plant that grows from a bulb with large delicate flowers in many colors except yellow

Apatura iris
  • Specialized
9.9

A large European butterfly with males that have shiny purple wings

A plant from southern Europe with large white flowers, lavender tips, and a fragrant underground stem

genus Iris
  • Specialized
7.2

A group of flowering plants that grow from bulbs or underground stems, like common garden flowers with showy blooms

A large garden flower with tall stems and colorful petals

gladdon iris
  • Archaic
9.9

A plant with purple flowers and smelly leaves that grows by the Mediterranean

Iris filifolia
  • Specialized
9.8

A small bulb plant with red-violet flowers that grows in Spain

Iris florentina
  • Specialized
8.9

A large white garden flower with a sweet-smelling underground root used in perfume

Iris foetidissima
  • Specialized
9.9

A plant with purple flowers and leaves that smell bad when crushed

Iris germanica
  • Specialized
7.0

A large iris with showy purple or white flowers grown in gardens

9.9

A garden iris with large white flowers slightly purple at the edges and a sweet-smelling root used for perfume

Iris kaempferi
  • Specialized
8.7

A garden plant from Japan with large, showy flowers

Iris kochii
  • Specialized
9.9

A small iris from northern Italy with deep blue-purple flowers

Iris pallida
  • Specialized
8.2

A European iris with soft pale blue flowers and a pleasant scent

Iris cristata
  • Specialized
9.1

A low-growing iris with crested petals

iris diaphragm
  • Specialized
7.6

A part with thin overlapping plates that controls how much light passes through a lens

iris family
  • Specialized
6.0

A group of flowering plants like irises and crocuses that grow from bulbs or underground stems

Iris persica
  • Specialized
9.9

A flowering plant that grows from a bulb with pale lilac flowers often grown in gardens

Iris pseudacorus
  • Specialized
8.5

A plant with bright yellow flowers that grows near water

Iris tingitana
  • Specialized
9.9

A bulb plant from North Africa with bright blue flowers grown in gardens

Iris verna
  • Specialized
9.9

A low-growing iris with bright blue to lilac flowers that blooms in spring

Iris versicolor
  • Specialized
8.3

A common iris with blue-violet flowers that grows in eastern North America

Iris virginica
  • Specialized
9.3

A plant with blue or violet flowers that grows in wet places in the eastern United States

Iris xiphioides
  • Specialized
9.9

A garden flower that grows from a bulb with large delicate flowers usually blue or violet

Iris xiphium
  • Specialized
9.9

A plant that grows from a bulb with purple flowers native to the western Mediterranean

A tall plant with large colorful flowers, usually purple or white, that grows near water

A flowering bulb from western Asia with pale lilac spring flowers

7.6

A plant from the western Mediterranean with purple flowers that grows from a bulb

9.9

A plant with purple flowers and very smelly leaves that grows every year

9.7

A low plant with bright blue-lilac flowers that blooms in spring

xiphium iris
  • Specialized
9.9

A plant that grows from a bulb and has violet purple flowers

A plant with bright yellow flowers that grows near ponds and rivers

How Open

aperture
  • Specialized
19 7.4
iris
  • Specialized
15 7.1
pinhole
9 4.3

Surface Forms

iris singular
irises plural

Etymology

Iris for the camera or microscope part is named after the eye's iris because both are round and change size to control 'light'. So the mechanical iris opens and closes like an eye to let in more or less light.