Creating your own IR pass filter — Photocritic Photo School
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Markus Keinaths Photohomepage - DIY IR DSLR Camera with exchangeable filter
Homemade infrared filter and DIY experiment to 'visualize' efficiency of light sources - YouTube
Markus Keinaths Photohomepage - DIY IR DSLR Camera with exchangeable filter
Amazon.com : Quanmin 9.6mm×1.0 mm 4PCS Slim Optical 650nm IR Cut Filter Infrared Filter Camera Lens for use with 4k Sports Camera DIY Modified GoPro Hero5 Hero6 Hero7 YI 4K/4K+/RX0 Black Action