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Optolong LRGB CCD 31mm Unmounted Filter Set LRGB Filter Set from Optolong
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Optolong LRGB CCD 31mm Unmounted Filter Set

SKU: OTL-LRGB-31U
$279.00

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The Optolong LRGB CCD 31mm Unmounted Filter Set has been discontinued, but here's another option:

The Optolong LRGB CCD 31mm Unmounted Filter Set has been discontinued, but here's another option:

This Astronomik LRGB Filter Set - 31 mm Round includes everything you need for stunning true-color images with your monochrome camera. Fitted with transmission properties enhanced for CMOS and CCD imaging and high transmission of 95-97%, enjoy sharp, high quality images of planets, stars, emission nebulae, and reflection nebulae. The 31 mm unmounted design drops into your filter wheel just as this Optolong LRGB CCD 31 mm kit does, making it a suitable alternative. Be sure to check out this Astronomik LRGB filter set today!


Optolong LRGB Filter Set - 31mm Unmounted

The Optolong LRGB Filter Set comes four 31mm unmounted filters, including Red, Green, Blue, and Luminance. They are designed for de-bayered monochrome CCD and CMOS cameras and work great for both planetary and deep-sky imaging. Like all Optolong filters that are designated as “CCD”, this filter set blocks infrared wavelengths from 700nm to 1100nm so you don't need a separate IR-Cut filter.

The transmission of each filter is designed for maximum contrast and beautiful results. There is a gap between the green and red filters that improve color balance and separation by blocking out the Sodium line at 589nm. Also, OIII emission is allowed to overlap on the blue and green filters for more natural color.

The Optolong 31mm Unmounted LRGB Filter Set is made with Schott glass that has been multi-coated with an ion-assisted deposition technology to ensure scratch resistance and stability on the central wavelength or CWL. This filter set is designed to be used in color filter wheels that accept 31mm unmounted filters. It doesn't matter which way you drop them into the filter wheel. The filters are unmarked and either side can face up or down.

Quality Filter Materials:

  • Schott B260 substrate material from Germany, 2.0mm thick
  • Multiple layers of anti-reflection non-cementing coatings applied via electron-beam gun evaporation with Ion-assisted deposition

Optolong Filter Manufacturing Processes and Parameters

  • Filter substrate is fine-optically polished to 1/4 wave and
  • Surface quality, according to MIL-O-13830, is 60/40
  • 95% transmission at bandpass
  • Infrared wavelength 700-1100nm cut-off
  • Optolong’s planetary rotation system is a homogenous and precise coating procedure that ensures both high transmission of pass-band and optical density of off-band
  • Each filter comes with a plastic case with high pressure EVA case lining

About Optolong

Optolong is the Astronomy Filters division of Yulong Optics, an optical filter design and processing company out of Kunming, China that has provided filters for over 700 optical companies since 1999. All Optolong filters pass European Union RoHS requirements and have been certified by TUV Rheinland and Bureau Veritas.