Absorptive Neutral Density (ND) Filter, Φ25mm, OD=0.4, United Optical Technology Co., Ltd (CAT#: STEM-OP-4123-YJL)

Absorptive Neutral Density (ND) Filter, Φ25mm, OD=0.4, model 248584, is manufactured by United Optical Technology Co., Ltd.
Absorbive Neutral Density (ND) Filter is also known as neutral density filter, neutral filter, ND filter, attenuation filter, fixed density filter, etc.
Absorptive neutral density filters generally refer to the material itself or the material mixed with certain elements, which absorbs light of certain wavelengths, while having no or little effect on light of other wavelengths. Generally, the damage threshold of absorptive neutral density filters is lower, and after long-term use, they may generate heat, so please pay attention when using them. Metal coating: broadband use, uniform wavelength attenuation, low power consumption.

Diameter: Φ25mm
Optical Density OD: 0.4
Design Wavelength: -
Material: Neutral grey glass
Transmitted Wavefront Error: λ/4@633nm
Parallelism: ＜1arcmin
Surface Quality: 60-40
Diameter Tolerance: +0.0/-0.2mm
Thickness: 1.36±0.5mm
Applied Wavelength Range: 400~700nm
Transmission(T): 0.4
Optical Density Tolerance: ±5%@633nm
Clear Aperture: ＞90%
Optical Density (OD): OD=-log(T/100)

ND filters absorb the portion of light that is not transmitted, uniformly reducing transmission in a certain portion of the spectrum.

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