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Usually, there are times when coaxial lighting is effective for observing inside a hole, but if the nozzle or hole is narrow, even coaxial lighting cannot see into the hole.
In fact, I tried taking pictures with coaxial lighting, but I couldn't see the inside of the nozzle properly.
So I tried looking at it from below using transmitted lighting.
By using transmitted illumination, the clog in the nozzle can now be seen.
Surface emitting transmitted lighting
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