SVBONY SV183 2'' IR Filters Pass 685nm Lens for Astronomy Telescope 350-1100nm

Description

Description:
The Svbony IR Pass filter blocks wavelengths below 670nm to enhance contrast and surface detail and reduce the effects of seeing when used in IR-LRGB imaging of the moon and planets. At these longer wavelengths, planetary images are less disturbed by wave front distortions in the atmosphere. Atmospheric seeing and distortion diminish as you move further away from visible light into the infrared, and since CCD and CMOS sensors are sensitive to IR light, imaging in the infrared will improve your results.
Features:
Sufficient reduction of seeing effects, heightened contrast: The IR Pass filter can be a great asset for daylight IR-imaging with a digital camera lessening seeing effects and improving contrast when utilized for lunar and planetary imaging.
The IR Pass 685nm Filter is made with high-end glass that has been multi-coated with an ion-assisted deposition technology to ensure scratch resistance and stability on the central wavelength.
The filter cell is made of lightweight, strong metal and is CNC machined, sand-blasted, black anodized, and then laser engraved. The result is a super thin filter cell that will produce a clear aperture of 26mm.
The Filter can darkens the twilight sky background, allowing mages of moon and planets to be taken at dawn or dusk.
In addition to astronomical uses, the IR-Pass filter can be used for nature photography in the Near-IR, revealing stunning differences in plants, sky, and clouds (requires use of a camera that is sensitive to IR above 670nm, such as a modified DSLR or webcam).
The filters are presented in a high-quality filter box.
Pls note: the filters of SVBONY are not designed for observation. It doesn't work for visual.
Specification:
Brand: SVBONY
Model: SV183
Product Name: IR Pass 685nm Filter
Material: B260
Size: 2-Inch
Substrate Thickness: 1.1mm
Clear Aperture：26mm
Wavelength Range: 350-1100nm
λcut-on: 670nm
Blocking: OD2@400-660nm
Peak transmittance: 670nm@T=50% 673-1100nm@T>95%
Surface Quality：60/40
Surface parallelism: 1/4λ
Parallelism: 30”
Material：Aviation Aluminum 6061T6
Thread: M28.5*0.6
Single Thread: Yes
Net Weight: 8g / 0.3oz /0.02lb
Package Details：
IR PASS 685nm Filter-2Inch
PP Plastic Box
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