Borescopes can be rigid or semi-rigid. A rigid borescope, also known as rigid endoscope or swing-prism endoscope, is an endoscope that uses a lens system for image transmission.
A semirigid borescope, also known as semirigid endoscope, miniscope, mini endoscope, or needlescope, is an endoscope with a rigid sheath that uses a bundle of optical fibers for image transmission (see flexible endoscopes).
Rigid borescopes are particularly robust and designed for heavy-duty industrial use. With the HOPKINS® II rod lens system, they reliably deliver exceptionally clear, sharp, and bright images.
The so-called swing prism borescope features a swing prism at its tip. Using a control handle, the direction of view can be infinitely adjusted between 0° and 140°. The sheath can be rotated by 400°. The result is the largest field of view available on the market.
Borescope diameters are between 1.6 mm and 10 mm in lens system models and between 1 mm and 1.6 mm in image guide models. For special applications, instruments with working lengths of up to 1.5 m are available.