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Alvium USB Cameras User Guide V3.6.4
Lenses: Focal length vs. field of view
Alvium 1800 U-240m/c
Values for 1800 U-240m/c cameras with Type 1/2.3 (7.9 mm diagonal) sensors:
Alvium 1800 U-291m/c
Values for 1800 U-291m/c cameras with Type 2/3 (10.8 mm diagonal) sensors:
Focal length [mm]
Field of view (H × V in [mm])
Object distance = 500 mm
Object distance = 1000 mm
4.8
691 × 433
1389 × 871
6
552 × 346
1110 × 696
8
412 × 258
831 × 521
12
272 × 171
552 × 346
16
203 × 127
412 × 258
25
127 × 80
261 × 164
35
89 × 56
185 × 116
50
60 × 38
127 × 80
Table 84: Focal length versus field of view for Alvium 1800 U-240m/c
Focal length [mm]
Field of view (H × V in [mm])
Object distance = 500 mm
Object distance = 1000 mm
6
644 × 642
1296 × 1293
8
481 × 480
970 × 968
12
318 × 317
644 × 642
16
237 × 236
481 × 480
25
149 × 148
305 × 304
35
104 × 104
216 × 215
50
70 × 70
149 × 148
Table 85: Focal length versus field of view for Alvium 1800 U-291m/c
