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.
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): 130
- Thickness (mm): 12mm
- Surface shape: L/4
- Centre wavelength (nm): 656.28
- Bandwidth (nm): 60
- Peak transmittance (%): 95%
- Cut-off range (nm): 200nm-1100nm
799.00 €
Estimated delivery time : 1 week
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): 130
- with metal cell 178mm
- Thickness (mm): 12mm
- Surface shape: L/4
- Centre wavelength (nm): 656.28
- Bandwidth (nm): 60
- Peak transmittance (%): 95%
- Cut-off range (nm): 200nm-1100nm
999.00 €
Estimated delivery time : 1 week
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): 150
- Thickness (mm): 12mm
- Surface shape: L/4
- Centre wavelength (nm): 656.28
- Bandwidth (nm): 60
- Peak transmittance (%): 95%
- Cut-off range (nm): 200nm-1100nm
999.00 €
Estimated delivery time : 1 week
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): 150
- with metal cell 230mm
- Thickness (mm): 12mm
- Surface shape: L/4
- Centre wavelength (nm): 656.28
- Bandwidth (nm): 60
- Peak transmittance (%): 95%
- Cut-off range (nm): 200nm-1100nm
1249.00 €
Estimated delivery time : 1 week
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): 200
- Thickness (mm): 12mm
- Surface shape: L/4
- Centre wavelength (nm): 656.28
- Bandwidth (nm): 60
- Peak transmittance (%): 95%
- Cut-off range (nm): 200nm-1100nm
1649.00 €
Estimated delivery time : 1 week
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): 200
- with metal cell 248mm
- Thickness (mm): 12mm
- Surface shape: L/4
- Centre wavelength (nm): 656.28
- Bandwidth (nm): 60
- Peak transmittance (%): 95%
- Cut-off range (nm): 200nm-1100nm
1999.00 €
Estimated delivery time : 1 week
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): 200
- with metal cell 330mm
- Thickness (mm): 12mm
- Surface shape: L/4
- Centre wavelength (nm): 656.28
- Bandwidth (nm): 60
- Peak transmittance (%): 95%
- Cut-off range (nm): 200nm-1100nm
2099.00 €
Estimated delivery time : 1 week
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): 240
- Thickness (mm): 15mm
- Surface shape: L/4
- Centre wavelength (nm): 656.28
- Bandwidth (nm): 60
- Peak transmittance (%): 95%
- Cut-off range (nm): 200nm-1100nm
3399.00 €
Estimated delivery time : 1 week
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): 350
- Thickness (mm): 20mm
- Surface shape: L/4
- Centre wavelength (nm): 656.28
- Bandwidth (nm): 60
- Peak transmittance (%): 95%
- Cut-off range (nm): 200nm-1100nm
7999.00 €
Estimated delivery time : 1 week
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.
829.00 €
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.
829.00 €
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.
829.00 €
Estimated delivery time : 3-4 weeks
