Product Description
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Neutral Density Filters
(i)Neutral Density Filters - Absorptive
(ii)Neutral Density Filters - Reflective
The main purpose of using neutral density filters is to reduce the amount of light that can pass through the lens. As a result, if a shutter speed is kept the same, after adding a neutral density filter, a larger aperture must be used to obtain the same exposure. Similarly, if an aperture is kept the same, after adding a neutral density filter, a slower shutter speed must be used to obtain the same exposure.
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Custom products
Our ability can be up to:
Material: Specified by customers
Diameter: 2-300mm
Diameter Tolerance: -0.10mm
Minimal Thickness:0.5mm
Parallelism: 1-3 arc minutes
Flatness: λ/10@632.8nm
Surface Quality:20-10 scratch dig
Optical Density:Specified by customers
Clear Aperture: 90% of Diameter
Coating: specified by customers