Optolong L-Quad Enhance Filter 2"

Description L-Quad Enhance Filter is a quad bandpass light pollution suppression filter for colour cameras. Better suppression of starbursts; Higher contrast and more details of the celestial bodies; Better colour saturation; Great performance on signal-to-noise ratio (SNR); Near IR cut-off to 1000nm, reducing the effects of IR noise; Good for night sky from Bortel 1 to Bortel 7 levels;  Suitable for wide range of deep sky targets cover 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 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.); Which to Choose? L-Pro provides the broadest spectrum and most natural color. Suitable for imaging nebula and galaxy targets. L-Quad similar to L-Pro, but more tailored for color astronomical cameras. UHC is not as broad spectrum, less natural color, but will block more stray light and skyglow than the L-Pro. Best suited to nebula targets, not broad spectrum targets like galaxies or clusters. L-Enhance is a narrow tri-band filter. Best suited to capturing dim nebula targets. Will decrease brightness of surrounding stars, allowing for more faint detail.  L-eXtreme is a dual-narrow-band 7nm filter providing a tight spectrum in only H-Alpha and OIII. Suitable for deep sky imaging under light polluted skies, and delivering the richest nebula detail. L-Ultimate is a dual-narrow-band filter, an enhanced version of the L-eXtreme with just a 3nm bandpass on both Ha and OIII. If you plan to use the filter to image a wide range of targets, the L-Pro is the most versatile. The L-Ultimate will provide the most faint detail on emission nebula. The L-Ultimate is different from the series of dual-narrowband L-eNhance and L-eXtreme in that L-Ultimate is a dual-3nm bandwidth filter that only passes through Ha and OIII emission lines. You will get a darker sky background, more contrast of the image and the suppression on stars. L-Ultimate has also been optimized in terms of halo performance, so that there is no obvious halo when shooting on a bright star object. Specifications Substrate optical glass Thickness 1.85mm FWHM O3 3nm+Ha 3nm Blocking range >OD4 Surface quality 60/40 Transmitted Wavefront RMS: λ/4 Parallelism 30 seconds Package Plastic PP Case Imported High Pressure EVA Case Lining Silver Cardboard Box Sizes Standard 2”   Sample Images  Nebulae Flying Bat and Squid in the constellation of Cepheus. Squid (OU4) is a region characterized by very weak OIII emission with a bipolar shape reminiscent of planetary nebulae. Recent studies suggest that Ou4 is actually internal to SH2-129 (the H-alpha-emitting flying bat nebula, reddish in the image), generated by a triple star system located in the center (HR8119, visible as the bright star in the center of Squid). The distance from our solar system is estimated at about 1300 light years. The lights were taken over 2 years, with total integration equal to 29 hours (21.5 for OU4 and 7.5 for SH2-129). This project gave me the opportunity to test the Omegon veTEC 571C camera and the Optolong L-Ultimate filter with excellent results for both products. Lights: 258x300s (Ou4, L-Extreme) + 30x900s (Sh2-129, L-Ultimate) Telescope1: Apocromatic TS PhotoLine 102 f/5,6 Triplet FPL53 Telescope2: Takahashi FS60CB @ f/4.2 Camera1: ZWO ASI 294mc Pro Camera2: Omegon veTEC 571C Mount: Skywatcher AZ-EQ6 GT Filters: Optolong Astronomy Filter L-Extreme + L-Ultimate Processing: DeepSkyStacker, Photoshop CC, PixInsight  Credit:Tommaso Massimo Stella (Italy)   Objects: Veil Nebula Camera: QHY168C Telescope: Pentax 100 SDUF II F/4 Mount: Skywatcher AZ-EQ5GT Filter: Optolong 3nm L-Ultimate Filter Frames: 13 x 240sec lights Credit:Tommy Lim KW (Malaysia)   Sh2-132 The Lion nebula Prosegue il test del filtro  Ultimate della Optolong Astronomy Filter 96 light da 300 sec  No dark no flat Credit:Andrea Maggi   Supernova remnant W63 Supernova remnant W63 glows like a faint cosmic smoke ring along the plane of the Milky Way toward the northern constellation Cygnus. Its spectral appearance is reflected in the region's rich complex of interstellar clouds and dust by an eerie blue glow, captured with Optolong's new dual band 3nn filter!! L-Ultimate... Canon Eos MK IV mod by CentralDS 20x900" ISO3200 Optolong L-Ultimate Skywatcher AZ-GTI mount Guide camera ZWO ASI 120MM Credit:José Jiménez (Spain)   Sharpless 129 Canon Eos MK IV mod by CentralDS 30x900" ISO3200 Optolong L-Ultimate Credit:José Jiménez (Spain)   NGC6888 HOO Version Telescope ASKAR 500 Camera Zwo ASI 6200 Filter Optolong 3nm Software Voyager Credit:Andrea Maggi (Italy)