The ZWO 36mm LRGB Filter Set includes four 36mm unmounted LRGB filters. Red, Green, Blue, and Luminance. They are a great match for the ZWO five-position color filter wheel. The filters have high transmission (over 90%), are anti-reflection coated on both sides and have IR-Cut built-in.

The ZWO LRGB 36mm filter has better transmission, better coating, better color separation the RGB color combine weights will be approximately 1:1:1

Features of the ZWO 36mm LRGB Filter Set

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

How to judge the positive and negative? It is a little bit hard to judge the LRGB filter sides. Please review the pictures below carefully. 

• Works on any filter wheel that accepts 36mm unmounted filters.
• ZWO LRGB 36mm filter (4 filters).
• Size: 36mm.
• Thickness: 2mm.