Borescope field of view is the cone of vision extending from the objective tip of the scope. A wider field of view shows more surface area at once, but it can reduce how much fine detail is resolved. A narrower field of view may show less area, but it can help inspectors focus on smaller indications when the setup is correct.
In practical inspection work, field of view should be selected with the access path, target size, viewing distance, lighting, and tip direction in mind. It also works with borescope depth of field and borescope direction of view, because viewing width, focus range, and tip angle all affect what the inspector can actually see.
Field of view tells you how wide an area the borescope tip can see. Wide FOV is useful for orientation and broad surface coverage, while narrower or application-specific FOV can help when the inspection needs more detail on a smaller area.
Field of view is the visible cone extending from the borescope objective tip.
Why a Wider Field of View Is Not Always Better
A wide field of view can make navigation easier because the inspector sees more of the surrounding area. That can be helpful in pipes, chambers, tanks, and open cavities where orientation matters.
The trade-off is detail. When the same image area covers more surface, small indications may be harder to judge. That is why a wide-view tip is not automatically the best choice for cracks, pits, edge damage, weld details, or measurement work.
How Interchangeable Tips Affect Field of View
Some videoscopes use interchangeable optical tips with different fields of view. That means the same system may support different inspection tasks depending on the tip installed.
The updated Mentor Visual iQ+ optical tip tables show that FOV can vary by probe diameter, tip direction, and measurement type. Examples include forward-view, side-view, and measurement tips with different FOV values, so the tip should be selected around the inspection target instead of treated as a generic accessory.
When comparing optical tips, do not look at FOV alone. Confirm field of view, direction of view, depth of field, probe diameter, brightness, and whether the tip supports visual inspection or measurement.
Field of View Selection Guide
Use the table below as a practical way to decide whether the inspection needs a broad scene or a more focused view.
Pipe Cameras vs Video Borescopes
The old AIT field of view note mentioned that pipe cameras typically use very wide fields of view to see the side walls of a pipe. That still makes sense because pipe inspection often requires broad orientation and wall coverage.
Video borescopes and videoscopes are often used in more varied inspection paths. A turbine blade, weld, casting, engine component, or internal cavity may require a different balance between FOV, lighting, depth of field, and direction of view.
How to Choose the Right Field of View
Start by deciding what the image needs to prove. Are you trying to find the target, inspect a large surface, document a broad condition, or evaluate a small indication?
Common Field of View Mistakes
Most FOV problems happen when the inspection team treats the widest view as the safest choice for every application.
Key Takeaways
- Borescope field of view is the cone of vision extending from the objective tip.
- A wider field of view shows more surface area, but it may reduce visible detail on small indications.
- Interchangeable optical tips can change field of view, depth of field, direction of view, and measurement capability.
- Pipe cameras often use wide FOV for wall coverage, while video borescopes may require more application-specific tip selection.
- Field of view should be chosen with target size, lighting, working distance, direction of view, and documentation needs.
Need help choosing the right borescope field of view, optical tip, direction of view, or focus range for your inspection?
Contact Us
