The ZWO LRGB  31mm filter has better transmission, better coating,  better color separation

the RGB color combine weights will be approximately 1:1:1

• Fine-optically polished to ensure accurate 1/4 wavefront
• more than 92% transmission at passband
• Infrared wavelength 700-1100nm cut-off
• Precision off-band blocking
• Multi-layers anti-reflection coating
• Small spectral “gap” to minimize effect of light pollution
• More parfocal – thickness 2 mm

Technical Parameter:

Name: ZWO 31mm LRGB filter (4 filters)

Size: D=31mm

Thickness: 2mm