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.

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ArteSky Energy Rejection Filter (ERF) 200mm

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

ArteSky Energy Rejection Filter (ERF) 200mm with metal cell 248mm

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

ArteSky Energy Rejection Filter (ERF) 200mm with metal cell 330mm

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

ArteSky Energy Rejection Filter (ERF) 240mm

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

ArteSky Energy Rejection Filter (ERF) 350mm

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

$Picture of 100mm ERF Glass, Cell & 120mm ID Cap - For refractor$

100mm ERF Glass, Cell & 120mm ID Cap - For refractor

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 €