The ZWO LRGB Filters has good performance in transmission, also it has good coating, good color separation.

1.25" LRGB Filters

Technical Parameter

Size: 1.25″

Thickness: 5.5 mm+2.5 mm(thread)

Thread: M28.5*0.6

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 700-1100 nm cut-off
• Precision off-band blocking
• Multi-layers anti-reflection coating
• Small spectral “gap” to minimize effect of light pollution
• More parfocal – thickness 1.9+/-0.03 mm

Transmission curve:

2″ LRGB Filters

Technical Parameter

Size: 2″

Thickness: 5 mm+2.5mm(thread)

Thread: M48*0.75

Thickness: 1.85mm

How to judge the positive and negative?

It is a little bit hard to judge the LRGB filters. Please watch the picture below carefully.

LRGB 36mm Filters

Technical Parameter

Size: 36mm

Thickness: 2mm

Transmission Curve