Optolong CLS-CCD Filter - Clip filter for Canon EOS APS-C Cameras [OPTO-APS-EOS-C-CLS-CCD]

Optolong: The Optolong CLS-CCD filter will improve contrast and increase the visibility of weak outer regions on most emitted, planetary and supernova residual nebulae from polluted locations in a color imaging camera.
The infrared wavelength of 700-1100nm is cut on the Optolong CLS-CCD filter, which makes it different from the standard CLS filter and makes the CLS-CCD a photographic filter only. A separate IR-cut filter is not necessary when imaging with the CLS-CCD since the IR has already been cut.
The Optolong CLS-CCD filter works by specifically reducing the transmission of wavelengths of light pollution, in particular the artificial type caused by vapors of sodium vapor and mercury vapor at high and low pressure. The use of a CLS-CCD filter will also increase the contrast by reducing the light radiation caused by the neutral oxygen emissions normally observed in the atmosphere.
The Opterster CLS-CCD EOS APS-C Clip Filter consists of multi-layered Schott glass with ion deposition technology to ensure scratch resistance and stability on the central wavelength, or CWL. The filter cell is made of light and solid metal, CNC machined, sandblasted, black anodized and then laser engraved.
Using a Clip Filter on Your Canon APS-C Camera
The Optolong CLS-CCD clip filter can be inserted without tools; Simply use your fingers to insert or remove the filter. Once inserted correctly, it can not fall unintentionally.
No modification of the Canon EOS DSLR case is required. All lens functions will work with the installed clip, including focus, screen and image stabilization,
The Optolong fog filter prevents dust from settling on the sensor during long exposures.
APS-C clip filters are compatible with EOS APS-C series cameras, including EOS 1100D / 600D / 60D, and so on. If you have a full frame EOS camera, Optolong also offers filters for these cameras.
Optolong Clip filters do not work with the Canon EF-S series lenses. These lenses invade the interior space of the camera body that would normally be supported by the clip filter.
To use the EOS / T2 and 2 "adapters to attach your camera to a telescope, you must first insert the Clip-Filter and then install the desired lens adapters.

Transmission characteristics of the CLS-CCD filter
95% transmission H-Alpha 656nm
95% transmission OIII 496nm and 500nm
95% transmission SII 672nm
95% H-Beta transmission 486nm
High transmission NII 654nm and 658nm
0.1% Hg transmission at 435 nm and 578 nm
0.1% Na transmission at 589 nm
Blocks IR transmission 700-1100nm

Quality filter materials:
Schott B260 substrate material from Germany, 1.0 mm thick Anodized and CNC machined aero-metal filter cell to provide the largest net opening; Laser engraved to avoid fading Several layers of cement-free anti-reflective coatings applied by evaporation from a gun to electron beams with ion assisted deposition Optolong Filter Manufacturing Processes and Parameters The filter substrate is optically polished at a 1/4 wave and parallelism <30 on both surfaces The quality of the surface, according to MIL-O-13830, is 60/40 The main emission lines of nebulae have a transmission of 95% Out-of-band transmission (main artificial radiation) is 0.1% High-pass transmission of the bandwidth and out-of-band optical density is ensured by Optolong's planetary rotation system, a homogeneous and precise coating procedure Each filter comes with a plastic housing with high-pressure EVA liner