The Dwarf3 telescope looks good easy to set up as a pensioner ILike it but not able to use it yet many thanks.
So far I am very impressed with the dwarf 3 I am getting the hang of setting it up the app is easy to follow
Antlia Solar Discover Dualband Energy Rejection Filter (ERF) - 2"
£104.00
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Antlia Solar Discover Dualband Energy Rejection Filter (ERF) - 2"
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, Solar, 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 the UV and IR part of the spectrum, and allow the desired wavelengths of 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＞95%
- 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 a telescope tube
- Antlia ERF 2’’ mounted filter is supposed to be installed at the back end of a refractor telescope, but before any other optical element(s), i.e. reducer, flattener, Barlow, star diagonal, prism etc.
- 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% |
|
Coating Range |
200-1700nm |
|
|
Filter Thickness |
10mm+/-0.05mm |
|
|
Size |
ERF glass 130mm with cell, for 130-190mm Fixed diameter ERF glass 150mm with cell, for 150-220mm Fixed diameter ERF glass 200mm with cell, for 200-250mm Fixed diameter |
|
Spectral Transmission
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;
- 2’’ ERF filter must working on 110mm or smaller refractors.
Available Sizes
- 2" (in a standard 2" filter cell),
- Dia130mm,
- Dia150mm
- Dia200mm
Warranty: 3-years
As authorised dealers for all our products they come with a full manufacturers warranty along with our satisfaction guaranteed, no-questions-asked full refund policy for a full 30 days.
Please see our returns policy for full details.
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Estimated delivery time is displayed at checkout.
See our shipping policy for more details.
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