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TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More

0.3 OD 25mm Diameter, Reflective ND Filter

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Stock #30-933 3-4 days
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Product Details

Type:
Neutral Density Filter

Physical & Mechanical Properties

Diameter (mm):
25.00
Thickness (mm):
1.60 Nominal
Dimensional Tolerance (mm):
±0.5
Clear Aperture (%):
80

Optical Properties

Angle of Incidence (°):
0
Optical Density OD (Average):
0.3
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Float Glass
Coating:
Surface 1: Inconel
Reflection (%):
21.00
Surface Quality:
80-50
Transmission (%):
50.00
Blocking Wavelength Range (nm):
400 - 700
Neutrality:
±5% of Optical Density
Surface Flatness (P-V):
4 - 6λ

Additional Info

Note:
Optical density values are average over specified blocking wavelength range.

Regulatory Compliance

RoHS 2015:
Certificate of Conformance:
REACH 241:

Product Family Description

  • Spectrally Flat
  • Maximum Accuracy and Neutrality at Moderate Price
  • Use Stacks to Create Intermediate Density Values

Reflective Neutral Density (ND) Filters have constant density values across the surface. The transmission-to-reflection ratio varies with density selection, whose relationship can be explained by the equation: T(Percent Transmission) = 10-OD x 100%. Optical Density exhibits an additive relationship; for example, stacking filters with OD values of 0.6 and 0.9 yields a resultant density of 1.5. In stacks, the total density is the sum of each filter's density. Reflective Neutral Density (ND) Filters are used primarily for attenuating light over a wide spectral range. They are often used in laser and photometer applications, where excessive power can cause damage or inaccurate results. For best results, orient the mirrored side toward the source at a 0° angle of incidence. 

Note: Low optical density filters (0.1, 0.15, and 0.2 OD) are coated with thin layers of Inconel and their performance may shift overtime. To prolong the lifetime of these filters, we recommend using non-contact cleaning methods (such as compressed air) and avoiding the use of these filters in humid environments to prevent oxidation. Using contact cleaning methods such as solvents will damage the coating and the product will no longer meet the advertised specifications. 

Note: Due to supply chain issues, our kits may be delivered with an alternative packaging solution in place of a wooden box. For any questions, please contact [email protected]

Reflective Neutral Density Filter Kits

Reflective Neutral Density Filter Kits are available with either 8 or 14 optical densities. The kits with 8 filters include our most popular filters, with densities of 0.3, 0.5, 1.0, 1.3, 1.5, 2.0, 2.5, and 3.0. The kits with 14 filters include all available densities, except for 3.0. Kits are ideal for determining precise system optical density requirements. Custom densities are available for OEM applications.

Title CompareStock Number  Price Buy
12.5mm Diameter, Reflective ND Filter Kit (14 Filters) #64-348 €384,00   Request Quote
  • 3-4 days
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25mm Diameter, Reflective ND Filter Kit (14 Filters) #64-349 €506,00   Request Quote
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50mm Square, Reflective ND Filter Kit (14 Filters) #64-350 €766,00   Request Quote
  • 3-4 days
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25mm Diameter, Reflective ND Filter Kit (8 Filters) #54-460 €435,00   Request Quote
  • Contact Us
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Filter

Understanding Neutral Density Filters

Neutral Density (ND) Filters are designed to evenly reduce transmission. For more information on specifications and products, read more at Edmund Optics.

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What is an ND Filter?

Can I place ND filters back-to-back and increase optical density?

What is the difference between using an absorptive ND filter and a reflective ND filter?

How should I orient my reflective ND or interference filter?

Continuously Variable Apodizing Filter

Neutral Density Filter (ND)

Optical Filters

Do you want to learn about optical filters? Find terminology, fabrication techniques, a selection guide, and application examples at Edmund Optics.

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How do I clean my filters?

What is the largest diameter filter available from Edmund Optics®?

What are some of the most common filter substrates?

How do I select the right filter for my application?

What types of filters can Edmund Optics® manufacture?

Filter

Optical Density (OD)

Stopband

Removing Protective Plastic Coating

A protective plastic coating protects a variety of our flat optics, such as optical windows, optical mirrors, and beamsplitters, from scratches during shipping.

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Transmission

How do I clean my optics?

Clear Aperture (CA)

Edmund Optics Global Manufacturing Facilities

Edmund Optics® (EO) manufactures millions of precision optical components and subassemblies every year in our 5 global manufacturing facilities.

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Metrology at Edmund Optics: Measuring as a Key Component of Manufacturing

Learn about the metrology that Edmund Optics® uses to guarantee the quality of all optical components and assemblies.

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Surface Quality

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