Optolong Venus-U Filter
The Venus-U filter makes it possible to obtain photographs, CCD or video images in the UV-A (320-400 nm) and observe Venus’ cloud structures.
Use with monochrome CCD cameras and you need to remove the cover glass of sensor and internal UV-IR blocker in order to pass UV light. The same holds true for mono DSLRs that its built-in low pass filter needs to be removed. What’s more, you need a special UV lens together with camera body. All-reflecting telescopes like Newtonians and RCs (without corrector) will also work if the reflective layers are made of aluminum. The sensor of CCD or CMOS cameras is capable of detecting light in the 350-1100 nm range.
WARNING: The filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning.
Coating Parameter
- Multi-layers anti-reflection coating
- Non-cementing optical substrate coating
- Electron-beam gun evaporation with 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.
Please note that this filter must never be used as the only solar filter!
