Overview: The Ealing catalog provides a comprehensive guide to optical components and instruments, focusing on optics, opto-mechanics, and filters, with detailed information on bandpass interference filters.

Optics: This section details various optical components such as lenses, microscope components, prisms, polarizers, filters, pinholes, mirrors, and beamsplitters. It emphasizes the availability of diverse optical instruments and light sources.

Opto-mechanics: This section covers essential components for precise optical alignment and positioning, including rails, mounting hardware, mirror and component mounts, manual micro positioners, and motorized positioners.

Filters: The document elaborates on different filter types, including bandpass, edgepass, color glass, and neutral density filters, explaining their specifications and applications.

Bandpass Interference Filters: These filters are designed for precise control of center wavelength and bandpass shape, available in multiple cavity designs to achieve specific spectral characteristics. They are noted for high peak transmission and stability.

Specifications: Specifications for UV, VIS, and IR bandpass filters include sizes, clear aperture, thickness, edge treatment, humidity resistance, temperature limits, substrate material, and surface quality. Attenuation specifications for different filter types are also provided.

Temperature and Wavelength Shift: The document discusses the impact of temperature changes on filter performance, including shifts in peak wavelength and transmission, and provides guidelines for operating temperature ranges.

Product Listings: Detailed listings of bandpass filters are included, specifying center wavelengths, bandwidths, peak transmissions, catalog numbers, and pricing for different diameters.

Specifications: Filters are made from Schott Color Glass and Schott Optical Glass, with a clear aperture greater than 90% of the central dimension and typical thickness of 2-3 mm. Surface quality is rated at 60-40, with commercial-grade surface polish.

Color Glass Filters: Eleven standard color glass filters are available, supplied in a foam-lined hardwood storage box, with types such as BG-25, BG-39, GG-420, and others. Prices vary based on size and type.

Absorptive Neutral Density Filters: These filters control intensity levels without affecting spectral response, available in optical density values up to 4, and can be stacked without concern for multiple reflections. They are calibrated at 546 nm and supplied in sets with a foam-lined hardwood storage box.

Reflective Neutral Density Filters: Using a layer of inconel on a UV fused silica substrate, these filters provide neutral attenuation over a wide wavelength range (280-2000 nm) and can also be used as beamsplitters.

Filter Storage Boxes: High-quality hardwood storage boxes, foam-lined for secure storage, are available in various sizes to accommodate different filter dimensions.