The LRGB filter set is designed for maximum contrast, with extremely high gradients for clear differentiation of colors. This filter set divides the spectrum into its component colors - red, green, blue, plus luminance. The OIII emission line overlaps blue and green filters, with maximum transmission to allow for high efficiency and natural color imaging. The gap between the green and red filters serves to block out the primary sodium light pollution line at 589nm and improves color balance and separation.
The included SHO filter set is generally used with astronomical monochrome CCDs and DSLRs. These types of filters are commonly used by astrophotographers to present their photos in the Hubble palette. This filter set includes narrowband filters for H-Alpha 7nm, SII 6.5nm and OIII 6.5nm, which cover the emission lines 656.3nm, 671.6nm and 500.7nm. The filters provide high light transmittance so as to obtain the maximum contrast with nebulae while cutting out background emissions and suppressing starlight and light pollution.
31mm and 36mm filters are unmounted
Specifications
LRGB Specifications
Tavg: T>95%Coating Wavelength: 300-1050nm
Optical Density: OD3
Surface Quality: 60/40
Transmitted Wavefront RMS: λ/4
Parallelism (arcsec): 30s
Filter Casing Width: 4.9mm
SHO Specifications
CWL (center of wavelength): H-Alpha 656.3nm, SII 671.6nm, OIII 500.7nmFWHM: H-Alpha7nm, SII 6.5nm, OIII6.5nm
Tpeak: <85%
Optical Density: OD 3
Surface Quality: 60/40
Transmitted Wavefront RMS: λ/4
Parallelism(arcsec): 30s
Filter Casing Width: 4.9mm