SVBONY KKZX0788 SVBONY IR Pass Filter 2" 685nm – High-Contrast Infrared Filter for Astronomy & Photography

Product Name: IR Pass 685nm Filter

Material: B260

Size: 2 inches

Substrate Thickness: 1.1mm

Clear Aperture: 44mm

Wavelength Range: 350-1100nm

Cutoff Wavelength: 670nm

Optical Density: OD2 @ 400-660nm

Peak Transmittance: 670nm @ T = 50% | 673-1100nm @ T > 95%

Surface Quality: 60/40

Surface Flatness: 1/4λ

Parallelism: 30 arc seconds

Material: Aerospace-grade Aluminum 6061T6

Thread Specification: M48 * 0.75

Single Thread: Yes

Net Weight: 15g / 0.53oz / 0.03lb

• Enhance Image Contrast and Reduce Visual Disturbance – The IR Pass filter is ideal for infrared imaging in daylight when used with a digital camera. For lunar and planetary imaging, it helps reduce atmospheric disturbances and improves contrast.
• Premium Glass with Advanced Coating – Made from high-quality optical glass, the IR Pass 685nm filter features multi-layer coatings applied through ion-assisted deposition technology, ensuring scratch resistance and wavelength stability.
• Durable Metal Frame with Precision Craftsmanship – The lightweight yet sturdy filter frame is CNC-machined, sandblasted, and anodized in black, followed by laser engraving. This results in an ultra-thin filter frame with a 26mm clear aperture.
• Ideal for Twilight Astronomy – This filter darkens the twilight sky background, making it perfect for capturing lunar and planetary details during dawn or dusk.
• Versatile Use in Infrared Photography – Besides astronomy, the IR-Pass filter is suitable for near-infrared photography, revealing unique contrasts in vegetation, sky, and clouds. It requires an infrared-sensitive camera (e.g., a modified DSLR or webcam).
• High-Quality Filter Housing – The filter is securely placed in a durable, precision-engineered frame for long-lasting use.
• Important Note – SVBONY filters are not designed for direct visual observation. They are intended for imaging purposes only.