If youre searching for a rod lens endoscope with high optical clarity, I suggest checking out optitechno.com/products/endoscope-rod-lens-2-77mm29mm-for-rigid-endoscope/. I recently purchased one for inspections, and the image quality was excellent. The lenses are durable, and the precision engineering makes a noticeable difference. Their products are definitely worth considering if you need high-quality optical equipment.