quartz filter at Filtronetics, Inc.
Premium quartz filter: Filtronetics, Inc designs manufactures frequency control products including high, low, band pass, notch, reject, electronic filters, TCXO, VCXO, and related oscillators and quartz crystals in um1 and SMD packages in the KHz, MHz and GHz range.
PolarPro QuartzLine Camera Filters | Photography Blog
Apr 10, 2018· PolarPro QuartzLine Camera Filters are new professionalfocused filters for DSLRs, mirrorless and cinema cameras. Constructed of % pure fused quartz, the QuartzLine Filters set a new bar for light transmission and purity as the rare, fused quartz element delivers an extremely low refractive ...