Our Circular Variable ND filters ( Mounted ) are designed to provide continuous variable attenuation by rotating the filter. Front side of our variable filter is coated with Inconel thin film and back side is antireflection coated to reduce unwanted reflection losses. Holmarc offers variable neutral density filters in two substrates; BK7 or equivalent & Fused Silica.
Substrate materials | : | Bk7 or equivalent & UV fused silica |
Surface quality | : | 40 - 20 ( scratch-dig ) |
Dimensional Tolerance | : | +0.00, -0.2 nm |
Thickness | : | 3 ± 0.2 mm |
Surface flatness | : | λ / 4 @ 632.8 nm |
Parallelism | : | ≤ 1 arc sec |
Coating | : | Front surface= Inconel Back surface = anti-reflection |
Absorptive Neutral Density Filters attain functions by absorbing light with minimal reflection. Holmarc’s absorptive neutral density filters are made by four special filter glass materials from Schott.
Reflective Neutral Density Filters attenuate the light beam by a combination of reflection and absorption. Holmarc’s reflective neutral density filters...
Model No. | OD ( mm ) | ID ( mm ) | Material | Price ($) |
HO-VND-N50 | 50 | 13 | BK7 or equivalent | 357.00 |
HO-VND-F50 | 50 | 13 | UV Fused Silica | 456.00 |
HO-VND-N75 | 75 | 25 | BK7 or equivalent | 431.00 |
HO-VND-F75 | 75 | 25 | UV Fused Silica | 527.00 |
HO-VND-N100 | 100 | 25 | BK7 or equivalent | 504.00 |
HO-VND-F100 | 100 | 25 | UV Fused Silica | 599.00 |
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