Lenses: Focal length vs. field of view
96
Alvium USB Cameras User Guide V3.1.3
About S-Mount lenses
Alvium S-Mount models have no filter. We recommend using S-Mount lenses with
an integrated IR-cut filter for a better image quality.
Read
Mounting and focusing S-Mount lenses
on page 106 to avoid damage when
using S-Mount lenses.
Focal length vs. field of view
Type 1 = 17.6 mm diagonal
Values apply to
1800 U-1236m/c
cameras.
Type 1 = 15.8 mm diagonal
Values apply to
1800 U-2050m/c
cameras.
Focal length [mm]
Field of view (H × V in mm)
Object distance = 500 mm
Object distance = 1000 mm
8
872 × 638
1759 × 1287
12
577 × 422
1168 × 854
16
429 × 314
872 × 638
25
270 × 197
553 × 405
35
188 × 138
391 × 286
50
128 × 93
270 × 197
75
80 × 59
175 × 128
Table 41: Focal length versus field of view (type 1 = 17.6 mm sensor cameras)
Focal length [mm]
Field of view (H × V in mm)
Object distance = 500 mm
Object distance = 1000 mm
8
811 × 542
1636 × 1093
12
536 × 358
1086 × 726
16
399 × 267
811 × 542
25
251 × 167
514 × 344
35
175 × 117
364 × 243
50
119 × 79
251 × 167
75
75 × 50
163 × 109
85
64 × 43
142 × 95
100
53 × 35
119 × 79
Table 42: Focal length versus field of view (type 1 = 15.8 mm sensor cameras)
