Need a 100mm+ Lens For a 1.3MP Camera - Recommendations?

I got a case where I need to look at a hole of 20x20cm at a distance of 12m and according to the lovely calculators I'm in need of roughly around 100mm+ lens. It says I actually need a 216mm lens, but I recon that with a 100mm I already have enough detail, but more is always better.

I have this scarey feeling I might need a motorised lens, and the prices on them ain't pretty.

Perhaps any of you know any lenses that could fit this case ? The closest I could find was a Fuijinon 8-80mm.

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