Product Details

About Optolong L-Quad Enhance Filter

The Optolong L-Quad Enhance Filter is a quad bandpass light pollution suppression filter for colour cameras. It effectively suppresses the transmission of light pollution wavelengths, especially light pollution generated by artificial lighting (including mercury and sodium lamps), as well as the effects of natural skylight-induced effects on the shot, thus effectively enhancing the contrast and details of the celestial bodies, and making the objects more distinct andstereoscopic. This filter provides better color balance while improving resistance of light pollution.

The L-QEF can be used for both wide field astrophotography, such as the Milky Way in Summer and Winter, and deep sky objects such as nebulae, galaxies, star clusters, and so forth. It allows you to save a lot of time during the shooting process and get better results at the same time. The design of quad bandpass maximises the colour balance of nebulae, galaxies and other broadband spectral targets.

Advantages

• Better suppression of starbursts;
• Higher contrast and more details of the celestial bodies;
• Better colour saturation;
• Better signal-to-noise ratio (SNR);
• Near IR cut-off to 1000nm, reducing the effects of IR noise;
• L-QEF has more than 90% transmittance of the nebula emission lines at H-Beta/OIII/H-Alpha/SII, with cut-off depth from OD2 to OD4, thus providing a significant increase in resistance to light pollution. L-QEF is good for night sky from Bortel 1 to Bortel 7 levels; (Bortel 8, Bortel 9 environments shall not be recommended, kindly chose Optolong other narrow-band filters, 3nm, 7nm type of filters are available.);
• Suitable for wide range of deep sky targets: it covers most nebulae, galaxies, star clusters, reflected and emitted line signals astronomical objects with higher contrast and rich details while maintaining excellent colour balance. L-QEF is superior to other filters of the same type

L- Quad Enhance Filter Spectrum
Based on the characteristics of celestial bodies’ emission lines and light pollution emission lines, L-Quad Enhance filter effectively reduces the impact of light pollution and suppresses the background light of astronomical objects, thus effectively enhancing the contrast and details of the celestial bodies. Using L-QEF filter can help you save a lot of time during the shooting process, yet obtaining incredible results.

• Substrate: Optical glass
• Thickness: 1.85mm
• FWHM: Quad bandpass filter
• Blocking range: 300-1000nm
• Blocking: OD2-OD4
• Surface quality: 60/40
• Transmitted Wavefront RMS: λ/4
• Parallelism: 30"

Filter Ring:

• 2" mounted (M48x0.75 male thread). At this time, we do not know if the female thread is long enough to be usable to stack other filters.

Other Information

• Country of Manufacture: China