Astronomik L-3 UV-IR Block 27mm, unmounted (SKU: 10163127 / 8h00o6)

Astronomik L-3 UV-IR Block 27 mm, unmounted (Astronomik, SKU: 10163127) is a luminance filter that blocks ultraviolet and infrared light when recording visible light. The L-3 version has the narrowest spectral window in the L-1/L-2/L-3 series and is intended for refractors and camera lenses with less-than-perfect colour correction.

Key features

• ultraviolet and infrared rejection when recording the luminance channel
• passband width matched to the optical system’s colour correction
• coatings using Astronomik MFR technology that reduce unwanted reflections
• unmounted glass for compatible 27 mm filter holders
• durable coatings resistant to scratches and moisture

Included items

• filter, Astronomik L-3 UV-IR Block 27 mm, unmounted
• protective filter box

Technical specifications

• manufacturer: Astronomik
• manufacturer SKU: 10163127
• type: UV-IR Block luminance filter
• version: L-3
• spectral window within the series: narrowest
• transmitted spectral region: visible light
• rejected regions: ultraviolet and infrared
• coatings: Astronomik MFR
• shape: round
• glass diameter: 27 mm
• construction: unmounted
• mechanical thickness: 1 mm
• glass thickness: 1 mm
• parfocality: with standard Astronomik filters using 1 mm glass
• country of manufacture: Germany

Choosing the appropriate luminance version helps make use of the optics’ correction when recording image detail.