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When shopping for objective lenses, you might come across terms like WD3.2, WD10, or WD20. But what does WD3.2 really mean? And how does it affect performance in mobile repair or circuit inspection?
In this guide, we’ll explore the meaning of working distance, break down what WD3.2 specifically stands for, and help you decide which objective lens is right for your repair tasks.
What Is Working Distance in a Microscope?
Working Distance (WD) refers to the distance between the front of the microscope’s objective lens and the surface of the object being observed when in focus.
This distance varies depending on:
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The magnification level of the objective lens
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The type of microscope (biological, stereo, digital, etc.)
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The design of the optics
Why It Matters:
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More working distance = more space to work with tools.
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Less working distance = higher magnification but tighter space.
For technicians involved in PCB repair, micro-soldering, and chip-level diagnostics, this is extremely important.
What Does WD3.2 Mean?
A lens marked WD3.2 means it has a Working Distance of 3.2 millimeters. In simpler terms:
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When the object is in clear focus under this lens,
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The front of the lens will be only 3.2mm away from the surface.
Key Characteristics:
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High magnification capability
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Short clearance space (not ideal for large soldering tools)
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Extremely sharp focus for detailed inspections
When Should You Use a WD3.2 Objective Lens?
A WD3.2 lens is generally used in the following scenarios:
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High-precision visual inspections of BGA or SMD components
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Identifying broken traces or solder bridges
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Detailed study of circuit pathways
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Imaging and documentation in repair labs
It is not recommended for tasks that involve:
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Large tweezers or soldering irons
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Thick or raised components
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Working under the lens with hand tools
WD3.2 vs Other Working Distances
A WD10 or WD20 lens might be a better fit for tasks involving active repair, whereas WD3.2 is best when your eyes do all the work.
Tools That Work Well With WD3.2 Lenses
If you're using a WD3.2 objective lens, here are some compatible tools:
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Fine-tip soldering iron
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Hot air rework stations with narrow nozzles
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Micropoint tweezers
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Optical inspection pens or probes
Pro Tip: Make sure your microscope stand has stable vertical movement to avoid crashing the lens into the PCB due to the tight working distance.
The L-Plan 100X/0.80 WD3.2 Objective Lens
One of the most popular WD3.2 lenses on the market today is the L-Plan 100X/0.80 ∞/0 WD3.2 Long Distance Objective Lens, widely used in advanced repair labs.
Why it’s Preferred:
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Provides 100x magnification for ultra-fine details
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Delivers sharp, distortion-free images
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Ideal for inspecting micro BGAs
