1. Start from the system failure mode

Before selecting a lens, define what optical failure would make the system unacceptable. Typical examples include:

• insufficient resolution on a distant target
• reduced contrast at low target-background temperature difference
• focus shift over temperature
• degraded off-axis image quality
• unstable radiometric accuracy
• excessive stray light or ghosting
• optical-axis shift under vibration,transmission degradation after environmental exposure

To read the entire article, visit Avantier, Inc.