Theatre Design & Technology - Summer 1979 - 8

Figure 5

d'=

~Ii--_ _-..:..d·

ti

--:::::=....

Q.

~

floor

Figure 6

image
camerain{

~

focal
length

Figure 7

IMACE
TV

camera~:

9).

2£'''
/3 tub!!

r 11tub!!/
'

1 /4 tub!!

16 mm cam!!ra
35 mm camera·..
Figure 8
6

~IZE~

son for this is the nature of the sketch. In a proscenium
theatre situation, a sketch is normally framed by the proscenium opening; the proscenium presents a convenient position for a hypothetical full-scale picture plane which your
reduced-scale sketch represents. In the process of designing
for video and film, you are likely to be dealing with sketches
that are part of a story-board. Such sketches, rather than
being framed by a proscenium arch, are framed as the camera might see the scene. There is no convenient position for a
picture plane, the floor might not be visible at all, and the
perspective is heavily dependent on the intended lens focal
length and camera distance. If you have a sketch which
shows very little perspective in terms of architectural lines,
and therefore presents great difficulties in using the above
methods, you'll probably have to start with some basic assumptions about camera lenses and distances. Each camera
lens covers a specific angle of view; a particular zoom lens
will cover a specific range of angles. The angle relates to the
focal length and to the size of the image formed in the camera-the receiving tube or film plane (Fig. 7).
For any particular camera, the image size is unchanging.
What can change, by changing lenses or zooming, is the focal
length, and consequently the angle of view. If you do not have
lens angle data available, you will need to calculate it from the
image size and focal length (Fig. 8). With this data available,
you can start analyzing a sketch by assuming either camera
distance or lens angle. The ratio between the width of the
scene and the distance from the scene to the focal point is
exactly the same as the image width to focal length ratio (Fig.

Theatre Design & Technology

6.6 X 8.8 mm
9.6 X12.8 mm
12.8 X 17.1 mm
7.4 X 10.2 mm
16.03 X 22.05 mm

Start your calculations by estimating the size of something
in the sketch (possibly the head of a figure, or a full figure if
present) and the scale of the sketch (measure the figure, and
divide by the estimated true size). On the basis of these
calculations, estimate the width of the scene at that figure's
position. If you assume a particular distance from the camera
to that figure, you can calculate the required lens angle (sid =
tan S); if, on the other hand, you assume a particular lens
angle, you can calculate the required distance from camera
to figure (d = sltan S). At this stage, it is also possible to
determine the viewing distance, based on the sketch width
USITT/Summer, 1979



Table of Contents for the Digital Edition of Theatre Design & Technology - Summer 1979

Contents
Theatre Design & Technology - Summer 1979 - 1
Theatre Design & Technology - Summer 1979 - 2
Theatre Design & Technology - Summer 1979 - 3
Theatre Design & Technology - Summer 1979 - Contents
Theatre Design & Technology - Summer 1979 - 5
Theatre Design & Technology - Summer 1979 - 6
Theatre Design & Technology - Summer 1979 - 7
Theatre Design & Technology - Summer 1979 - 8
Theatre Design & Technology - Summer 1979 - 9
Theatre Design & Technology - Summer 1979 - 10
Theatre Design & Technology - Summer 1979 - 11
Theatre Design & Technology - Summer 1979 - 12
Theatre Design & Technology - Summer 1979 - 13
Theatre Design & Technology - Summer 1979 - 14
Theatre Design & Technology - Summer 1979 - 15
Theatre Design & Technology - Summer 1979 - 16
Theatre Design & Technology - Summer 1979 - 17
Theatre Design & Technology - Summer 1979 - 18
Theatre Design & Technology - Summer 1979 - 19
Theatre Design & Technology - Summer 1979 - 20
Theatre Design & Technology - Summer 1979 - 21
Theatre Design & Technology - Summer 1979 - 22
Theatre Design & Technology - Summer 1979 - 23
Theatre Design & Technology - Summer 1979 - 24
Theatre Design & Technology - Summer 1979 - 25
Theatre Design & Technology - Summer 1979 - 26
Theatre Design & Technology - Summer 1979 - 27
Theatre Design & Technology - Summer 1979 - 28
Theatre Design & Technology - Summer 1979 - 29
Theatre Design & Technology - Summer 1979 - 30
Theatre Design & Technology - Summer 1979 - 31
Theatre Design & Technology - Summer 1979 - 32
Theatre Design & Technology - Summer 1979 - 33
Theatre Design & Technology - Summer 1979 - 34
Theatre Design & Technology - Summer 1979 - 35
Theatre Design & Technology - Summer 1979 - 36
Theatre Design & Technology - Summer 1979 - 37
Theatre Design & Technology - Summer 1979 - 38
Theatre Design & Technology - Summer 1979 - 39
Theatre Design & Technology - Summer 1979 - 40
Theatre Design & Technology - Summer 1979 - 41
Theatre Design & Technology - Summer 1979 - 42
Theatre Design & Technology - Summer 1979 - 43
Theatre Design & Technology - Summer 1979 - 44
Theatre Design & Technology - Summer 1979 - 45
Theatre Design & Technology - Summer 1979 - 46
Theatre Design & Technology - Summer 1979 - 47
Theatre Design & Technology - Summer 1979 - 48
Theatre Design & Technology - Summer 1979 - 49
Theatre Design & Technology - Summer 1979 - 50
Theatre Design & Technology - Summer 1979 - 51
Theatre Design & Technology - Summer 1979 - 52
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https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966May
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966Feb
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965Dec
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965Oct
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965May
https://www.nxtbookmedia.com