ERF-Filter
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ERF-Filters
ERF (Energy-Rejection-Filter) are essential components for solar observation. They protect the telescope and eyes from the high-energy radiation (IR heat radiation, UV radiation) and enable narrow-band filtering for observation and photography.
The Altair Dichroic Solar Energy Rejection Filter or D-ERF protects your telescope and solar imaging equipment from excessive heat build-up when solar imaging or observing with your Daystar Hydrogen Alpha Quark, or other Hydrogen Alpha Etalon filters.
756.00 €
Estimated delivery time : 1-2 weeks
Energy protection filters are long-pass filters that block short-wave light. A coating blocks IR. This means that the filters of an H-alpha telescope are only exposed to red light.
- Diameter (mm): 100
- Thickness (mm): 12mm
- Surface shape: L/4
- Centre wavelength (nm): 656.28
- Bandwidth (nm): 60
- Peak transmittance (%): 95%
- Cut-off range (nm): 200nm-1100nm
- with metal cell 146mm
699.00 €
Estimated delivery time : 1 week
The Altair Dichroic Solar Energy Rejection Filter or D-ERF protects your telescope and solar imaging equipment from excessive heat build-up when solar imaging or observing with your Daystar Hydrogen Alpha Quark, or other Hydrogen Alpha Etalon filters.
699.00 €
Estimated delivery time : 2-4 weeks
DayStar Energy Rejection Filters reduce the heat load on your filter assembly by absorbing or reflecting UV and/or I light and transmitting light in the desired visual spectrum.
659.00 €
Estimated delivery time : 3-4 weeks
DayStar Energy Rejection Filters reduce the heat load on your filter assembly by absorbing or reflecting UV and/or I light and transmitting light in the desired visual spectrum.
659.00 €
Estimated delivery time : 3-4 weeks
DayStar Energy Rejection Filters reduce the heat load on your filter assembly by absorbing or reflecting UV and/or I light and transmitting light in the desired visual spectrum.
659.00 €
Estimated delivery time : 3-4 weeks
DayStar Energy Rejection Filters reduce the heat load on your filter assembly by absorbing or reflecting UV and/or I light and transmitting light in the desired visual spectrum.
659.00 €
Estimated delivery time : 3-4 weeks
DayStar Energy Rejection Filters reduce the heat load on your filter assembly by absorbing or reflecting UV and/or I light and transmitting light in the desired visual spectrum.
659.00 €
Estimated delivery time : 3-4 weeks
This pre-filter is used for heat reduction for H-alpha observation with H-alpha filters in the tube and in prominence attachments.
560.00 €
Estimated delivery time : 1-4 days
Energy protection filters are long-pass filters that block short-wave light. A coating blocks IR. This means that the filters of an H-alpha telescope are only exposed to red light.
- Diameter (mm): 100
- Thickness (mm): 12mm
- Surface shape: L/4
- Centre wavelength (nm): 656.28
- Bandwidth (nm): 60
- Peak transmittance (%): 95%
- Cut-off range (nm): 200nm-1100nm
499.00 €
Estimated delivery time : 1 week
This pre-filter is used for heat reduction for H-alpha observation with H-alpha filters in the tube and in prominence attachments.
455.00 €
Estimated delivery time : 1-4 days
This pre-filter is used for heat reduction for H-alpha observation with H-alpha filters in the tube and in prominence attachments.
315.00 €
Estimated delivery time : 1-4 days
