American Cinematographer - June 2024 - 10
Shot Craft By Jay Holben
A user-tunable Otto Nemenz/P+S Technik Ottoblad lens.
Lens Aberrations and Tunable Optics
The cinematographer's choice
of lens significantly impacts the
visual expression of the story
being told. Generally speaking,
the cinematographer chooses a
lens for an entire project or on a
scene-by-scene basis. In most
cases, the characteristics of the
lens are fixed, and if the cinematographer
wants more or less
character, they must switch to a
different lens.
One of the most exciting developments
in modern lens design
is the introduction of optics that
have variable characteristics
within a single lens - and this
goes beyond the amount of
aberration that can be reduced in
many lenses by stopping down.
Several companies now offer
more malleable options, giving
10 / JUNE 2024
cinematographers a great deal
of creative control within a single
family of lenses.
Physics and the Balancing Act
First, some background.
As I've said many times before,
no lens is perfect. The very fact
that light passes through another
medium - in this case, glass -
means it is altered by the new
medium, and there is always
some loss of integrity in the
image reproduction.
Certain properties of physics
are unavoidable. One is that
light passing through the very
center of the lens is altered the
least by the glass, but rays that
pass through the lens farther
from the center become more
compromised and subject to
image-reproduction errors (i.e.,
aberrations). When an optical
designer creates a new lens
prescription, they are working
primarily to mitigate these
aberrations and get the best performance
out of the lens, given
restrictions of cost, size, speed,
format, etc.
There are seven primary aberrations
- spherical, chromatic,
astigmatism, coma, field curvature,
geometric distortion and vignetting
- and there are multiple
variations thereof. Each element
in the lens offers the designer
up to five " degrees of freedom, "
each of which can be specially
designed to correct an aberration.
These degrees are: front-of-thelens
curvature, back-of-the-lens
curvature, lens thickness, glass
type and spacing between the
lens elements.
Each degree of freedom in
optical design, especially curvature
of front and back surfaces
and spacing between elements,
is critical and must be precise
down to hundredths or even
thousandths of a millimeter. This
exactitude is necessary for the
lens to perform to the designer's
prescription.
With an extremely simple
optical design, such as the Cooke
Triplet, all seven aberrations
can be fairly well mitigated with
just three optical elements and
their spacings. Modern lenses,
however, often feature 10 or more
elements of glass to produce an
even more refined image.
The faster a lens is - meaning,
PHOTO BY JAY HOLBEN.
American Cinematographer - June 2024
Table of Contents for the Digital Edition of American Cinematographer - June 2024
Contents
American Cinematographer - June 2024 - Intro
American Cinematographer - June 2024 - Cover1
American Cinematographer - June 2024 - Cover2
American Cinematographer - June 2024 - 1
American Cinematographer - June 2024 - Contents
American Cinematographer - June 2024 - 3
American Cinematographer - June 2024 - 4
American Cinematographer - June 2024 - 5
American Cinematographer - June 2024 - 6
American Cinematographer - June 2024 - 7
American Cinematographer - June 2024 - 8
American Cinematographer - June 2024 - 9
American Cinematographer - June 2024 - 10
American Cinematographer - June 2024 - 11
American Cinematographer - June 2024 - 12
American Cinematographer - June 2024 - 13
American Cinematographer - June 2024 - 14
American Cinematographer - June 2024 - 15
American Cinematographer - June 2024 - 16
American Cinematographer - June 2024 - 17
American Cinematographer - June 2024 - 18
American Cinematographer - June 2024 - 19
American Cinematographer - June 2024 - 20
American Cinematographer - June 2024 - 21
American Cinematographer - June 2024 - 22
American Cinematographer - June 2024 - 23
American Cinematographer - June 2024 - 24
American Cinematographer - June 2024 - 25
American Cinematographer - June 2024 - 26
American Cinematographer - June 2024 - 27
American Cinematographer - June 2024 - 28
American Cinematographer - June 2024 - 29
American Cinematographer - June 2024 - 30
American Cinematographer - June 2024 - 31
American Cinematographer - June 2024 - 32
American Cinematographer - June 2024 - 33
American Cinematographer - June 2024 - 34
American Cinematographer - June 2024 - 35
American Cinematographer - June 2024 - 36
American Cinematographer - June 2024 - 37
American Cinematographer - June 2024 - 38
American Cinematographer - June 2024 - 39
American Cinematographer - June 2024 - 40
American Cinematographer - June 2024 - 41
American Cinematographer - June 2024 - 42
American Cinematographer - June 2024 - 43
American Cinematographer - June 2024 - 44
American Cinematographer - June 2024 - 45
American Cinematographer - June 2024 - 46
American Cinematographer - June 2024 - 47
American Cinematographer - June 2024 - 48
American Cinematographer - June 2024 - 49
American Cinematographer - June 2024 - 50
American Cinematographer - June 2024 - 51
American Cinematographer - June 2024 - 52
American Cinematographer - June 2024 - 53
American Cinematographer - June 2024 - 54
American Cinematographer - June 2024 - 55
American Cinematographer - June 2024 - 56
American Cinematographer - June 2024 - 57
American Cinematographer - June 2024 - 58
American Cinematographer - June 2024 - 59
American Cinematographer - June 2024 - 60
American Cinematographer - June 2024 - 61
American Cinematographer - June 2024 - 62
American Cinematographer - June 2024 - 63
American Cinematographer - June 2024 - 64
American Cinematographer - June 2024 - 65
American Cinematographer - June 2024 - 66
American Cinematographer - June 2024 - 67
American Cinematographer - June 2024 - 68
American Cinematographer - June 2024 - 69
American Cinematographer - June 2024 - 70
American Cinematographer - June 2024 - 71
American Cinematographer - June 2024 - 72
American Cinematographer - June 2024 - 73
American Cinematographer - June 2024 - 74
American Cinematographer - June 2024 - 75
American Cinematographer - June 2024 - 76
American Cinematographer - June 2024 - 77
American Cinematographer - June 2024 - 78
American Cinematographer - June 2024 - 79
American Cinematographer - June 2024 - 80
American Cinematographer - June 2024 - Cover3
American Cinematographer - June 2024 - Cover4
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