Measurement Terms

Working Distance

What is "Working Distance"?

• The working distance is the distance between the top surface of a sample and the tip of the objective lens when the sample is in focus.
  This is a critical parameter when observing with optical instruments, such as microscopes (Figure 1).
• Also called W.D. (Working Distance).
• In general, the higher the magnification of the objective lens, the smaller the working distance.
  

Figure1

Impact of Working Distance

Optical devices with a large working distance offer several key advantages:

• Allows for effective observation of sample surfaces with steps or hole bottoms (Figure 2).
• Improved operability provides a larger working space (Figure 3).
• Minimizes accidental collisions during focusing, protecting both the sample and the instrument.
  

Figure 2　　　　　　　　　　　　　　　　　　　　　　　　　　　　　Figure 3

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