Optolong OWB Original White Balance Filter - EOS APS C Clip [OPTO-APS-EOS-C-OWB]

Optolong: If you have a Canon EOS APS-C camera that has been converted for astronomical use, this clip-in Optolong OWB filter will allow you to use your camera for terrestrial photography again. Clip the filter in to take terrestrial images, and remove it when you are ready to do astrophotography—its the best of both worlds!
The Optolong EOS APS OWB Clip Filter 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. Each filter cell is made of lightweight, strong metal and is CNC machined, sand-blasted, black anodized, and then laser engraved.
Using a Clip Filter on your Canon APS-C Camera
The Optolong EOS APS Clip filter can be inserted without tools; just use your fingers to insert or remove the filter. Once inserted correctly, it cannot unintentionally fall out.
No changes to the housing of Canon EOS DSLR are required. All lens functions will work with the Clip installed, including focus, screen, and image stabilization,
The Optolong clip filter prevents dust from settling on the sensor during long exposures.
The APS-C clip filters are compatible with EOS APS-C series cameras, including EOS 1100D/600D/60D, etc. If you have a full frame EOS camera, Optolong offers clip filters for these cameras as well.
Optolong Clip Filters do not function with the Canon EF-S series lenses. These lenses invade the space inside the camera body that would normally be taken up by the clip filter.
To use EOS/T2 and 2” adapters to attach your camera to a telescope you’ll need to insert the Clip-Filter first and then install the desired lens adapters.
Quality Filter Materials:
Schott B260 substrate material from Germany, 1.0mm thick
CNC machined and black anodized aero-metal filter cell that is ultra-thin to provide largest clear aperture; Laser-engraved to prevent fading
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 <30 parallelism over both surfaces
Surface quality, according to MIL-O-13830, is 60/40
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