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How to make a Variable Zoom Head Lens from a photocamera's telescopic lens

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For all magnifying glass enthousiasts, precision art workers, investigators, biologists, micro electrotechnicians, jewelrepairmen, Borg, and many more, improve life and joy, build a Variable Zoom Head Lens.Having both hands free for your expert work and at the same time having eye for crystal clear...
By: Qwertypat

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