Feature

●The L-Ultimate Filter is a dual band filter that transmits two wavelengths of Ha and OIII, and the biggest feature is an extremely narrow transmission band of 3nm half-width
●The L-eXtreme filter transmits the main 2 lines of nebula, making it ideal for nebula shooting with DSLRs, Color/Monochrome CMOS cameras and CCD cameras
●Filter Size: 1.25"
●Size: 3.0 x 3.0 x 0.8 inches (7.5 x 7.5 x 2 cm); Weight: 1.1

Description

The L-Ultimate Filter is a dual band filter that transmits two wavelengths of Ha and OIII, and the biggest feature is an extremely narrow transmission band of 3nm half-width
The L-eXtreme filter transmits the main two lines of nebula, making it ideal for nebula shooting with DSLRs, Color/Monochrome CMOS cameras and CCD cameras.
The wavelengths other than HA and OIII are cut out, so it is also effective for shooting nebula in urban areas.
Size is 31.7mm (1.25").

When using a camera lens or telescope, the transmission wavelength may be shifted depending on the angle of light entering it.

Avoid attaching camera lens to the front of objective lens, and the aperture ratio of the lens should be F4 to be used.