Chroma Ha8LRGB 50 mm unmounted filter set (Chroma Technology, SKU: CT-27102-50D) is designed for astrophotography with monochrome CCD and CMOS cameras. It contains matched luminance, red, green and blue filters together with an 8 nm narrowband H-alpha filter. This configuration enables LRGB imaging and the addition of data recorded in the hydrogen H-alpha emission line.
• complete five-filter set for LRGB and H-alpha imaging
• 8 nm H-alpha filter centred at a wavelength of 656.3 nm
• matched passbands of the luminance, red, green and blue filters
• durable coatings applied using magnetron sputtering
• primary filter coatings on the front surface and anti-reflection coatings on the rear surface
• single 3.0 mm optical substrates without laminated construction
• parfocal design with other 3.0 mm Chroma astronomy filters
• blackened edges reducing internal reflections
• round 50 mm diameter format intended for compatible filter wheels and optical trains
• one Chroma H-alpha 8 nm 27003 filter, 50 mm, unmounted
• one Chroma Luminance 27040 filter, 50 mm, unmounted
• one Chroma Red 27041 filter, 50 mm, unmounted
• one Chroma Green 27042 filter, 50 mm, unmounted
• one Chroma Blue 27043 filter, 50 mm, unmounted
• manufacturer: Chroma Technology
• set series: Ha8LRGB
• set catalog number: 27102
• SKU: CT-27102-50D
• number of filters: 5
• filter types: H-alpha 8 nm, Luminance, Red, Green, Blue
• diameter of each filter: 50 mm
• filter shape: round
• cell: none, unmounted filters
• optical substrate thickness: 3.0 mm
• H-alpha filter central wavelength: 656.3 nm
• H-alpha filter FWHM bandwidth: 8 nm
• coating type: durable magnetron-sputtered coatings
• rear-surface coating: anti-reflection AR coating
• optical construction: single glass substrate
• edge finish: blackened
• surface accuracy: λ/4 or better
• transmitted wavefront: better than 0.25 wave per inch
• parfocality: with 3.0 mm Chroma astronomy filters
• compatible cameras: monochrome CCD and CMOS cameras
• recommended optical-system focal ratio: f/4 or slower
• usage restriction: the H-alpha filter is not intended for observing or photographing the Sun
The set combines the natural colour rendition of LRGB data with high-contrast detail from structures emitting H-alpha radiation while maintaining a common optical thickness across all five filters.
