0.5mm Thick, C-Mount Brass Spacer Ring

05mm brass spacer rings used in optics and photonics applications are available at Edmund Optics

Flat Brass Washer O Ring Solid Brass Oring Gasket Shim Copper Metal Meson Pad Spacer M2 M3 M4 M5 M6 M8 M10 M12 M14 M16 M18 M20 - AliExpress

35mm Color Corrected Schneider Compact VIS-NIR Lens

LUCID Vision Labs Triton TRI028S-MC

OD 1.5 NIR, 12.5mm Dia. Non-Reflective ND Filter

Ball Bearing 6x10x3mm Wheel Hub 2pcs

C-Mount Extension Tubes and Spacer Rings

FLIR Blackfly BFLY-U3-23S6M-C Camera

200 x 600mm Sheet of Spectral Black Foil, Adhesive

25mm Diameter, C-Mount Polarizer Holder

Sutemribor 420PCS M2 M3 M4 Male Female Hex Brass Spacer Standoff Screw Nut Assortment Kit: : Industrial & Scientific

Brass Shim 6 x 7.5 x 2.5mm 2pcs

400-700nm OD 2.0, M30.5 x 0.5 Absorptive ND Filter