*Made of Didymium glass
*Reduces Light Pollution in Night Sky
*Absorbs Yellow Sodium-Vapor Light
*Absorbs Yellow Mercury-Vapor Light
*Absorbs Yellow Light from Low CRI LED's
*9-Layer Multi-Coating, Optical Glass Model Number: KPN02 Size: 95mm Material: Ring: 6063 aluminium alloy Filter: neodymium glass Length: 110mm Height: 23mm Width: 132mm
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