LBTEK Round Mounted Reflective Neutral Density Filters have an optical density (OD) range of 0.2-4.0, with an optical component size of Ø25.4 mm. By depositing chrome-nickel-iron alloy (single-sided) on an N-BK7 substrate, a smooth OD value curve is achieved within the 1100-1700 nm range. Although they are reflective neutral density filters, the chrome-nickel-iron alloy coating still absorbs some incident light. To ensure optimal performance, it is recommended that incident light enters from the side with the chrome-nickel-iron alloy coating. At the same time, be careful to prevent contact with this unprotected metal film, as contact may scratch the unprotected surface. It is recommended to use an air blower when cleaning. The MNDFR series of reflective neutral density filters come mountde in detachable standard lens tubes, with their surface engraved with product model, working wavelength, OD value, and other parameters for easy user identification.

LBTEK unmounted circular reflective neutral density filters feature an optical density (OD) range of 0.2-4.0 with a diameter of Ø25.4 mm. By depositing chromium Inconel alloy (single-sided) on N-BK7 substrates, these filters achieve a smooth OD value curve within the 1100-1700 nm range. Although classified as reflective neutral density filters, the chromium Inconel coating still absorbs some incident light. For optimal performance, it is recommended that incident light enters from the side with the chromium Inconel coating. At the same time, be careful to prevent contact with this unprotected metal coating, as contact may scratch the unprotected surface. It is recommended to use an air blower when cleaning.