# Field-Of-View Calculator

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```					     A   B          C                D                E               F              G      H
1
2

3
Field-Of-View Calculator
4
5
6
7              clip width            p            hAngle
8
9                 9.75             6.35              75
10
11
12            Instructions
13
14            1. Find out what size (in 1:1) is your view clip
15                           a. create new layer at 1:1
16                           b. create temp. perspective:
17                                               b1. use Set 3D View
18                                               b2. observe clip outline
19                           c. go to 1:1 scale layer
20                           d. make sure your Layer Options are set to Show Others
21                           e. use 2d Polygon tool to trace outline of view clip
22                           f. See Obj. Info palette for view clip size.
23                           g. Enter clip width in chart above.
24
25            2. Select desired 35mm lens angle of view from chart below
26                            a. note: desired lens angle corresponds to hAngle above
27
28            3. Go to chart at top, and enter the desired lens angle under hAngle
29                            a. p-value is automatically displayed.
30
31            4. Now apply the info to your drawing
32                           a. Go back to original drawing layer (NOT 1:1 scale layer)
33                           b. Use Set 3D View to create view--choose Orthogonal.
34                           c. Go to View/Perspective/Set Perspective
35                           d. Enter p-value you've chosen above.
36
37            8. The resulting view should represent the image generated by the chosen 35mm lens.
38
39
40           Horizontal Angles of View for 35 mm film Lenses
41
42            Focal Length Angle of View
43                 20           83
44                 24           74
45                 28           64
46                 35           53
47                 50           39
48                 55          36.1
49                 85          23.9
A   B         C               D                 E              F            G            H
50                100              20
51                105             19.5
52                135              15
53                180             11.5
54                200             10.3
55
56
57           Additional info on lens angles and formulas can be obtained at the following URLs:
58           http://www.vidpro.org/lenschart.htm
59           http://www.eci.com/StudioOne/page26.html       (formulas)
60           http://mir.com.my/rb/photography/fototech/chart/index.htm

```
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