Fiber bundle quality & imaging questions

Hi,

What is the best fiber bundle for fiberscope, borescope and endoscope? Is it plastic or glass? What kind? For those cheap fiberscopes, what material does it usually use and how long does it usually last? I presume that every movement can cause microscopic strain like bending a metal that can cause it to break eventually? Does this happen to fiber cables generally? Or what class is vulnerable to this effect?

Also when I use a fiberscope, the images seen from afar is very small. What size of objective lens must be used to make the image the same size as viewed direct from the eyes? Normally fiberscope lens is about 2mm in size, must I make it 7mm to make the object seen thru the eyepiece as large as normal?? or can extra lens be used to make the 2mm size objective lens work at larger image scale?

Thanks.

Mu

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Mu
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