GCC-3030 Circular Metallic Variable Neutral Density Filters

Four circular metal-film gradient neutral-density filters are listed by complete model and range labels from 0.0–1.0 to 0.0–3.0. Cards describe a linear gradient and photographs show light/dark discs with central openings, but numeric units, density distribution and dimensions are undefined. These descriptions retain source labels and visible construction without using the shared photograph as a substitute for model-specific data or calibration.

Models and source range labels

GCC-303001/303002/303003/303004 carry range labels of 0.0–1.0, 0.0–1.5, 0.0–2.0 and 0.0–3.0 respectively. The title identifies circular metal-film gradient neutral-density filters and the specification line says linear gradient. The numeric line gives no OD designation, units or measurement definition. Ranges are retained as source labels without transmission conversion or invented density tolerance.

Gradient distribution and spectral data

Photographs show light/dark regions and a sector boundary but no angle-to-density, position-to-density or transmission calibration curve. They do not establish whether linearity refers to rotation angle, radius or translation. Photographic brightness is not a quantitative density measurement. Operating band, spectral flatness, reflectance, polarization and incidence-angle requirements are unspecified.

Construction and mounting

Images show thin circular discs with central round openings and dark edges. Diameter, bore, thickness, usable optical area, substrate, coated face and mounting interfaces are absent. The central opening does not establish a shaft fit or an included rotation mechanism. A two-disc display does not establish a two-piece pack; holders, handwheels, drives and bases are not listed as supplied items.

Operating conditions and supply

The metal-film designation comes from the source and does not establish metal composition, substrate, absorption/reflection balance or power capability. Laser damage threshold, permitted power, temperature limits and cleaning instructions are unspecified. Agree custom dimensions separately; no custom SKU is listed. Confirm quantity, delivery, calibration data and mounting requirements.

Selection checklist

Complete model and range definition

Gradient coordinate and calibration data

Diameter, central opening, thickness and mounting

Operating band, power conditions and quantity

To be confirmed

Range units, density definition and tolerance

Gradient distribution, usable area and calibration curve

Diameter, bore, substrate and mounting interface

Band, damage threshold, temperature, cleaning and delivery