1. Wavelength range: 350-1100nm
2. Cut-off wavelength: 670nm
3. Light barrier: OD2 @ 400-660nm
4. Peak transmittance: 670nm @ T equal to 50% 673-1100nm @ T over 95
5. Surface quality: 60/40
6. Parallelism: 30 inch
7. Material: aviation aluminum 6061T6, B260
8. Thread: M28.5 x 0.6
9. Substrate thickness: 1.1mm
10. Through hole diameter: 26mm
11. Net weight: about 8g

Features:
1. Sufficiently reduce the viewing effect and enhance the contrast, can be well used for daylight infrared imaging, when used for lunar and planetary imaging, it can reduce the viewing effect and enhance the contrast
2. Multi-layer coating, scratch-resistant, center wavelength stability
3. Made of lightweight and sturdy metal and CNC machined, sandblasted, black anodized and then laser engraved
4. Filter darkens the twilight sky background for photographing the moon and planets at dawn or dusk
5. In addition to astronomical use, it can also be used for nature photography in the near infrared (requires the use of a camera sensitive to infrared above 670nm, e.g. as a modified DSLR or webcam)
6. Please note that the filters are not designed for observation purposes and do not apply to vision