TEXASLAWMAN
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It's just like cameras the better the lens the better sharpness and light gathering capabilities. A thermal is nothing more than a camera that sees heat but it still needs a lens to send that image to the core. This is just me speculating but I think IR Defense used a smaller lense with a better core to try and reduce prices and improve profit margin. The germanium lens is usually the most expensive part. I would love to see that BAE 12 core behind a 100mm lens.