What’s causes of haze of borescope field / attention on using borescope?

The borescope contains a very elongated “glass” lens (rod lens) inside.

Therefore, if you receive a strong impact instantaneously, the glass lens inside may crack or break.

 

For glass protection, it is enclosed in a stainless steel tube. But, please be careful especially when handling long and small diameter.

               

Drop    
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Touching    
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Bending (bending with a strong force from the side)
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The most common problem with borescope troubles is that the field of vision is hazy.

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When it breaks completely, it turns black.  
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If it breaks or cracks, it will replace all lens parts.

The repair fee will also be expensive.

The bottom photo is the actually broken lot lens.

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For preventive measures, some customers are using the following commercially available tubes.

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