2PCS 43-60mm Optical Glass Plano-Convex Lens DIY Optional Focusing Condenser

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44mm Optical Glass Lens LED Plano-convex DIY Optional Focusing Condenser Lens

Optical Glass Optional LED Plano-convex Lens DIY Focusing Condenser Lens 28-40mm

2PCS Optical Glass Lens LED Plano-convex DIY Optional Focusing Condenser Lens

M42 M52 M58 M62 to M65 Thread Ring Adapter for Lens Focusing Helicoids Tube 65mm

1oz HELIMAX-XP Camera Telescope Optical Instrument Focusing Helicoid Grease PTFE