36mm Round Optical Filters

They also work with older STT and self-guided Aluma wheels. These filters are built for SBIG to our exacting specifications. All filters are parfocal, which avoids unnecessary refocusing. They are 2mm thick.
 

Filters and filter set available include:

• Luminance (L)
• Red (R)
• Green (G)
• Blue (B)
• Clear (C)
• Hydrogen Alpha (Ha) – 656.3 nm, bandwidth 6.5 nm
• Sulphur II (SII) – 672.4 nm, bandwidth 6.5 nm
• Oxygen III (OIII)  – 500.7 nm, bandwidth 6.5 nm
• LRGB Color Imaging Package (four filters)
• Narrowband Package – Ha, SII, OIII (three filters)
• Deep Sky Package – L, R, G, B, Ha, SII, OIII (seven filters)

Clear passes all wavelengths but is parfocal with the other filters.
 

Spectral response for LRGB filters

• 36mm Round Optical Filters