Although there is an eyepiece, I'll admit to never having looked through it directly. I have always attached a camera, a C-mount style camera. A recording which can be viewed mutiple times is too valuable to be trusted to the memory of a naked eye view.
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Link to Lingchuang Yihui
Because of the C-mount lens, higher resolution chip cameras are available for attached cameras when compared to chip-on-tip cameras on flexible endoscopes.
For more information, please visit rigid endoscope structure.