VIS Metal Coated Neutral Density Filter, Φ25mm, OD=0.5, United Optical Technology Co., Ltd (CAT#: STEM-OP-4087-YJL)

VIS Metal Coated Neutral Density Filter, Φ25mm, OD=0.5, model 248548, is manufactured by United Optical Technology Co., Ltd.
VIS Metal coated Neutral Density (ND) Filter, also known as neutral density filter, neutral filter, ND filter, attenuation filter, fixed density filter, etc.
Metal coating: broadband use, uniform wavelength attenuation, low power consumption. It can be used in optical imaging systems, smoke meters, optical measuring instruments, near-infrared spectrometers, biochemical analysis equipment, etc.

Diameter: Φ25mm
Optical Density OD: 0.5
Design Wavelength: 550nm
Material: Optical Grade Float Glass (B270)
Transmitted Wavefront Error: λ/4@633nm
Parallelism: ＜30arcsec
Surface Quality: 40/20-60/40
Diameter Tolerance: +0.0/-0.2mm
Thickness: 2mm±0.2mm
Applied Wavelength Range: 400~1100nm
Transmission(T): 0.32
Optical Density Tolerance: ±5%@550nm
Clear Aperture: ＞90%
Optical Density (OD): OD=-log(T/100)

ND filters reflect the portion of light that is not transmitted, uniformly reducing transmission in a portion of the spectrum. Reflective neutral density filters use the principle of thin film interference to transmit part of the light and reflect the other part.

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