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Alvium USB Cameras User Guide V3.3.0
Lenses: Focal length vs. field of view
About S-Mount lenses
Alvium S-Mount models have no filter. For typical applications, 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 167 to avoid damage when
using S-Mount lenses.
Focal length vs. field of view
Alvium 1800 U-040m/c
Values apply to 1800 U-040m/c cameras with Type 1/2.9 (6.3 mm diagonal)
sensors.
Focal length [mm]
Field of view (H × V [mm])
Object distance = 500 mm
Object distance = 1000 mm
2.8
892 × 667
1789 × 1337
3.6
693 × 518
1390 × 1039
4.8
518 × 387
1041 × 778
6
414 × 309
832 × 622
8
309 × 231
623 × 465
12
204 × 153
414 × 309
16
152 × 114
309 × 231
25
95 × 71
196 × 146
Table 70: Focal length versus field of view for Alvium 1800 U-040m/c
