ZWO LRGB 36mm Filters - LRGB36

The ZWO LRGB 36mm unmounted filters have 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 2mm

Sometimes it's hard to tell which side of the filter is the top, and which is the bottom.  The image below should help you: