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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Altair 90mm Aperture TRIBAND D-ERF Solar Energy Rejection Filter - H-Alpha CaK CaH (95mm Glass)

Reduces approx. 98% of heat reaching the optics to keep Etalon from drifting off-band and protects your expensive equipment.
Spectrographic Transmission test report included showing the performance of each individual filter.
32-36nm FHWM Bandpass at H-alpha wavelength of 656.28 nm Transmission ~ 95-98% (Tolerance is about 3%).
32-36nm FHWM Bandpass with CWL at 395nm covering Calcium H-Line and Calcium K-Line wavelengths. Transmission - 85-90% (Tolerance is about 3%).
Visible light blocking (area of maximum solar radiation and heat generation): Average OD4 ~0.001%T @400-700nm.
UVIR average blocking OD5 ~0.001%T between 200-1100nm
Extra Deep IR Blocking up to 1700nm Average OD2 (1%) (lowest solar radiation).
Quartz Element Diameter 95mm, Thickness 8mm, Weight 125g
Multilayer coatings with SiO2 protective overcoat for a long life and easy cleaning.
ERF Holder cell included with soft tip threaded knobs. Tough and very light, easy to disassemble for cleaning the filter with optical wipes. Cell does not put any tension on the optics. For this reason the glass element is able to move slightly within the cell by about 0.5mm.

549.00 €

Estimated delivery time : 1-2 weeks (valid for new orders)

Altair 185mm Aperture TRIBAND D-ERF Solar Energy Rejection Filter - H-Alpha CaK CaH (190mm Glass)

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 ...

2520.00 €

Estimated delivery time : 1-2 weeks (valid for new orders)

Antlia Solar Discover Energy Rejection Filter in 2" Filter Cell - M48x0.75 Thread

The filter reflects heat radiation and is designed for small refractors and camera lenses. It is necessary for H-alpha and calcium solar photography.

2" filter thread with M48x0.75 external thread - low profile mount
Suitable for use in front of the H-alpha or calcium attachment for refractors up to 100mm aperture
Suitable for small camera lenses or refractors in front of the lens
25 nm transmission in the H-alpha and calcium range - Transmission 90
Min. 1/4 lambda accuracy - plane-parallel discs in high quality cell

149.00 €

Estimated delivery time : Unbekannte Lieferzeit (valid for new orders)

Antlia Solar Discover Dualband ERF filter 130 mm in cell

Antlia Solar Discover Dualband ERF filter 130 mm in cell

1114.00 €

Estimated delivery time : 3-4 days (valid for new orders)

Antlia Solar Discover Dualband ERF filter 150 mm in cell

Antlia Solar Discover Dualband ERF filter 150 mm in cell

1449.00 €

Estimated delivery time : 3-4 days (valid for new orders)

Antlia Solar Discover Dualband ERF filter 200 mm in cell

Antlia Solar Discover Dualband ERF filter 200 mm in cell

2635.00 €

Estimated delivery time : 3-4 days (valid for new orders)

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 (valid for new orders)

Altair 115mm TRIBAND H-Alpha CaK D-ERF (120mm Filter mit Zelle)

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. Now you can save money by combining Hydrogen Alpha, Calcium K-Line and Calcium H-Line in one TRIBAND pre-filter.

Product Features:

Reduces approx. 98% of heat reaching the optics to keep Etalon from drifting off-band and protect your equipment.
30nm FHWM Bandpass at H-alpha (H) wavelength of 656.28 nm (Full Width Half Minimum) Transmission: ~95.5%
40nm FHWM Bandpass with CWL at 395nm covering Calcium H-Line and Calcium K-Line wavelengths. Transmission: ~90.5%
UVIR blocking OD3 0.1% @400-1100nm blocking over 98% of heat to your 3rd party Etalon at eyepiece or camera end, E.g. Daystar Quark). Please note it's your responsibility to use a proper commercial Etalon with this product, and to follow the manufacturer's instructions.
Visible light blocking: OD4 0.01% @400-700nm to reduce reflection effects and over 98% of heat.
Diameter 120mm Thickness 12.0mm (required to achieve surface precision)
Multilayer coatings with SiO2 protective overcoat.
ERF Holder cell included with soft tip threaded knobs. Tough and very light, easy to disassemble for cleaning the filter with optical wipes. Cell does not put any tension on the optics.

832.00 €

Estimated delivery time : 1 week (valid for new orders)

ArteSky Energy Rejection Filter (ERF) 100mm withmetal cell 146mm

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 (valid for new orders)

ArteSky Energy Rejection Filter (ERF) 130mm with metal cell 178mm

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 (valid for new orders)

ArteSky Energy Rejection Filter (ERF) 150mm with metal cell 230mm

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 (valid for new orders)

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 (valid for new orders)

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 (valid for new orders)

ArteSky Energy Rejection Filter (ERF) 100mm

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 (valid for new orders)

ArteSky Energy Rejection Filter (ERF) 130mm

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 (valid for new orders)

ArteSky Energy Rejection Filter (ERF) 150mm

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 (valid for new orders)

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 (valid for new orders)

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 (valid for new orders)

Altair 115mm Aperture Hydrogen Alpha D-ERF (120mm filter with housing cell)

756.00 €

Estimated delivery time : 1-2 weeks (valid for new orders)

Altair 120mm Hydrogen Alpha D-ERF Solar Filter (30nm OD5 BK7)

699.00 €

Estimated delivery time : 2-4 weeks (valid for new orders)

Baader D-ERF 110 mm Energy Rejction Filter for Solar Observation with H-alpha Filters

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 (valid for new orders)

Baader D-ERF 135 mm Energy Rejction Filter for Solar Observation with H-alpha Filters

This pre-filter is used for heat reduction for H-alpha observation with H-alpha filters in the tube and in prominence attachments.

900.00 €

Estimated delivery time : 1-4 days (valid for new orders)

Baader D-ERF 160 mm Energy Rejction Filter for Solar Observation with H-alpha Filters

This pre-filter is used for heat reduction for H-alpha observation with H-alpha filters in the tube and in prominence attachments.

1120.00 €

Estimated delivery time : 1-4 days (valid for new orders)

Baader D-ERF 180 mm Energy Rejction Filter for Solar Observation with H-alpha Filters

This pre-filter is used for heat reduction for H-alpha observation with H-alpha filters in the tube and in prominence attachments.

1659.00 €

Estimated delivery time : 1-4 days (valid for new orders)

Baader D-ERF 75 mm Energy Rejction Filter for Solar Observation with H-alpha Filters

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 (valid for new orders)

Baader D-ERF 90 mm Energy Rejction Filter for Solar Observation with H-alpha Filters

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 (valid for new orders)

$Picture of Altair 130mm Aperture Energy Rejection filter - Ha Hydrogen Alpha only D-ERF for 5" Refractors$

Altair 130mm Aperture Energy Rejection filter - Ha Hydrogen Alpha only D-ERF for 5" Refractors

Product Features:

Reduces approx. 98% of heat reaching the optics to keep Etalon from drifting off-band and protect your equipment.
30-40nm FHWM Bandpass at H-alpha (H) wavelength of 656.28 nm (Full Width Half Minimum) Transmission: ~90%
UVIR blocking OD3 0.1% @400-1100nm blocking over 98% of heat to your 3rd party Etalon at eyepiece or camera end, E.g. Daystar Quark). Please note it's your responsibility to use a proper commercial Etalon with this product, and to follow the manufacturer's instructions.
Visible light blocking: OD4 0.01% @400-700nm to reduce reflection effects and over 98% of heat.
Diameter 140mm Thickness 12.0mm
Multilayer coatings with SiO2 protective overcoat.
ERF Holder cell included with soft tip threaded knobs. Tough and very light, easy to disassemble for cleaning the filter with optical wipes. Cell does not put any tension on the optics and will not scratch or damage your telescope. It also won't alter the balance as much as an aluminium cell.

999.00 €

Estimated delivery time : 2-4 weeks (valid for new orders)

Altair 152mm Aperture Hydrogen Alpha D-ERF Solar Energy Rejection Filter

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 ...

1588.00 €

Estimated delivery time : 1-2 weeks (valid for new orders)

$Picture of Altair 130mm Aperture TRIBAND Solar D-ERF for 5" Refractors$

Altair 130mm Aperture TRIBAND Solar D-ERF for 5" Refractors

Reduces approx. 98% of heat reaching the optics to keep Etalon from drifting off-band and protect your equipment.
30nm FHWM Bandpass at H-alpha (H) wavelength of 656.28 nm (Full Width Half Minimum) Transmission: ~95.5%
40nm FHWM Bandpass with CWL at 395nm covering Calcium H-Line and Calcium K-Line wavelengths. Transmission: ~90.5%
UVIR blocking OD3 0.1% @400-1100nm blocking over 98% of heat to your 3rd party Etalon at eyepiece or camera end, E.g. Daystar Quark). Please note it's your responsibility to use a proper commercial Etalon with this product, and to follow the manufacturer's instructions.
Visible light blocking: OD4 0.01% @400-700nm to reduce reflection effects and over 98% of heat.
Diameter 140mm Thickness 12.0mm (required to achieve surface precision)
Multilayer coatings with SiO2 protective overcoat.
ERF Holder cell included with soft tip threaded knobs. Tough and very light, easy to disassemble for cleaning the filter with optical wipes. Cell does not put any tension on the optics.

989.00 €

Estimated delivery time : 2-4 weeks (valid for new orders)

$Picture of 100mm ERF Glass, Cell & 150mm ID Cap - For refractor$

100mm ERF Glass, Cell & 150mm 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 €