Features: high quality.
The filter darkens the background of the dusk sky to capture moon and planet magicians at dawn or dusk.
In addition to astronomical applications, ir-Pass filters can also be used for near infrared nature photography to detect surprising differences in plants, sky and clouds (this requires the use of an infrared camera over 670nm such as modified DSLR or webcam).
The filter is housed in a high-quality filter frame.
Specifications:Material: B260
Size: 3.18 cm/1.25 inches.
Substrate thickness: 1.1 mm.
Optical aperture: 26 mm.
Wavelength range: 350-1100nm
Limit wavelength: 670 nm.
Light blocking: OD2@400-660nm
Peak transmission: 670nm @ T = 50% 673-1100nm @ T > 95%.
Surface quality: 60/40.
Surface parallelity: 1/4 λ
Parallelity: 30 inches.
Material: Aviation Aluminum 6061T6
Thread: M28.5 x 0.6
Single Thread: Yes
Package includes: 1 x telescopic filter.