1. IR Pass685 Introduction
Optolong IR Pass 685nm filter is designed to block wavelengths below 670nm and can be used in IR-LRGB imaging to produce a sharper luminance image for the best planetary contrast as atmospheric seeing and distortion is much reduced at longer IR wavelengths.
The sensor of CCD or CMOS cameras is capable of detecting light in the 350-1100nm range including infrared wavelengths. Thus RGB planetary images taken with IR as the luminance channel have visible-enhanced contrast and surface detail than standard LRGB images.
2. IR Pass685 Spectrum and Characteristic
Sbustrate: B270
Thickness: 1.85mm
Tave: T>90%
Blocking range: 350-1050nm
Blcoking depth: light pollution line blocking >99%
Surface quality: 60/40
Transmitted Wavefront RMS: λ/4
Parallelism: 30s
How to read the chart?
▲The horizontal axis is the Wavelength in Nanometers(nm).
▲The vertical axis is transmission in %.
3. Coating Technology
·Multi-layers anti-reflection coating
·Non-cementing optical substrate coating
·Optolong L-Pro filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.
·Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.
4. Gloable Price
| IR Pass 685 filter MAP | Unit Price in USD dollars |
| 1.25" mounted | $79.00 |
| 2" mounted | $119 |
5. Packing
Outer Box: silve box
Plastic Box: PP material
Lining: imported high pressure white EVA material
Warm prompt
●About color: due to the influence of ambient light, color difference of the display and flash photography, the color of the product may have some color difference. Detailed color is in accordana with the final product.
●About coating: the interference filter will show different colors under different light, which is a normal phenomenon. Please refer to the material object.
●About the style: in order to improve the product, the change of design/appearance/parameters has not been updated in time. Please see the subject produce.
●About the description: the series of this product have the same material, technology and design, different sizes only, please note.
Optolong IR Pass685 features 2 sizes:
★1.25"(1 1/4" mounted), 2" mounted for eyepiece
