The Antlia Dualband Solar Energy Rejection Filter is designed by combining Hydrogen Alpha, Calcium K-Line and Calcium H-Line in one dualband filter. It is the filter used in conjunction with Antlia Solar Discover 3nm CaK, 5Å CaK or similar product to protect your solar imaging equipments from high temperature and bandpass shifting by rejecting massive heat before it enters telescope when imaging and observing solar.
They are very effective at blocking UV and IR light, and allow the desired wavelengths Ha 656.3nm, CaK 393.3nm and CaH 396.8nm to pass through.
Product Features:
- FWHM 25nm with CWL at H-alpha wavelength of 656.3nm; Transmission: T＞90%
- FHWM 25nm with CWL at CaK wavelength 393.3nm covering Calcium K-Line 393.3nm and Calcium K-Line 396.8nm; Transmission: T＞90%
- Coating Range: 200-1700nm wavelengths
- Finished with the most advanced multi coatings
- Coated on heat resistant double-polished substrate
- Antlia ERF 130mm, 150mm，200mm filters are mounted in a housing/cell to hold it in front of the telescope
- Antlia ERF 1.25'', 2'' mounted filter are installed on the back end of the refractor telescope
- Transmitted Wavefront: Lambda/4 or better.
Product Specifications:
|
Antlia Dual ERF Filter |
H-alpha |
CaK & CaH |
|
FWHM |
25nm |
25nm |
|
CWL (Central Wavelength) |
Ha 656.3nm |
CaK 393nm covering CaK 393.3nm & CaH 396.8nm |
|
Peak Transmission |
90% |
90% |
|
Substrate |
Quartz glass |
|
|
Coating Range |
200-1700nm |
|
|
Filter Thickness |
10mm+/-0.05mm for 130mm,150mm,200mm mounted 3mm+/-0.05mm for 1.25'' and 2'' mounted |
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|
Application |
ERF glass 130mm with cell, for 135-190mm Fixed diameter ERF glass 150mm with cell, for 165-220mm Fixed diameter ERF glass 200mm with cell, for 195-250mm Fixed diameter 1.25'' and 2'' mounted sizes are installed on the back end of the refractor telescope |
|
Spectrum Curve:
Important Notes:
- The Antlia Dual ERF filters cannot be used on its own. It must be used together with the professionally made solar imaging equipments, which have their own complete blocking filters assembled. Such as Antlia Solar Discover 5Å CaK, Solar Discover 3nm CaK Assembly, Dualband Ha, CaK and CaH filter Assembly;
- Please do not use the Antlia Dualband ERF filter by itself for visual observation;
- 1.25''，2'' ERF filter must working on 110mm or smaller refractors.
Sizes available and MAP Prices：
- Warranty: 3-years
