Optolong L-Quad Enhance Filter 2"

Optolong L-Quad Enhance Filter quad bandpass light pollution suppression filter

L-QEF cuts out light pollution from mercury and sodium lamps and produces a nice broadband image with minimal colour cast. This filter is a broadband filter that suppresses light pollution wavelengths. It is good for star clusters, dark and reflection nebulae, and galaxies from light-polluted skies.

L-Quad Enhance Filter (L-QEF) 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 and stereoscopic. This filter provides better color balance while improving resistance of light pollution.

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.

Astrophotographic results obtained with this filter on Astrobin

Here you find astrophotos made with this filter: Link zu Astrobin

Key Features:

Cuts out light pollution from mercury and sodium lamps and produces a nice broadband image with minimal colour cast

Increases Signal-to-noise ratio (SNR)

Near IR cut-off to 1000 nm, reducing the effects of IR noise - in opposite to the Antlia AN-QUAD-2

L-QEF has more than 90% transmittance of the nebula emission lines at H-beta/[O III]/H-alpha/[S II], 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 Bortle 1 to Bortle 7 levels (Bortle 8, Bortle 9 environments shall not be recommended, kindly chose Optolong other narrow-band filters, 3 nm, 7 nm 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.

Question:
What is the difference between L-Pro and L-Quad from Optolong?

Answer from Teleskop-Service:
The L-Pro and L-Quad filters are similar. The most important difference is that the L-Quad is slightly more open towards the infrared to still capture the near infrared light. This makes sense especially when photographing galaxies, as these objects have exciting information even in the near IR. Shortly after 700 nm, the filter then closes, blocking out the far IR light and thus preventing blurring. So the filter also has the function of a UV/IR blocking filter.

Safety informations: PDF Download