241Alvium USB Cameras User Guide V4.6.1
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 266 to avoid damage when
using S-Mount lenses.
Focal length vs. field of view
Alvium 1800 U-030 VSWIR
Values for 1800 U-030 VSWIR cameras with Type 1/4 (4.1 mm diagonal) sensors:
Focal length [mm]
Field of view (H × V [mm])
Object distance = 500 mm Object distance = 1000 mm
4 407 × 322 817 × 647
5 775 × 773 1557 × 1553
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 113: Focal length versus field of view for Alvium 1800 U-030 VSWIR
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