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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$Picture of Altair 115mm Aperture Hydrogen Alpha D-ERF for 4" 4.5" Refractors$

Altair 115mm Aperture Hydrogen Alpha D-ERF for 4" 4.5" Refractors

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 ...

604.20 €

Delivery date : 1-4 weeks

Picture of Altair 130mm Aperture D-ERF MonoBand Ha Solar Pre-Filter - with Cell

Altair 130mm Aperture D-ERF MonoBand Ha Solar Pre-Filter - with Cell

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 ...

1116.81 €

Delivery date : 1-4 weeks

Picture of Altair 140mm D-ERF TriBand Solar Pre-Filter - with Cell

Altair 140mm D-ERF TriBand Solar Pre-Filter - with Cell

The Altair 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 Ha Quark, or other Etalon filters.

1407.56 €

Delivery date : 4-8 weeks

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

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 ...

1200.84 €

Delivery date : 1-4 weeks

Picture of Altair 152mm Aperture TRIBAND D-ERF Solar Energy Rejection Filter (Hydrogen Alpha plus CaK CaH)

Altair 152mm Aperture TRIBAND D-ERF Solar Energy Rejection Filter (Hydrogen Alpha plus CaK CaH)

The Altair 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 Ha Quark, or other Etalon filters.

1461.34 €

Delivery date : 4-8 weeks

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

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.

696.64 €

Delivery date : 3-4 weeks

$Picture of 100mm ERF Glass, Cell & 130mm ID Cap - For refractor$

100mm ERF Glass, Cell & 130mm 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.

696.64 €

Delivery date : 3-4 weeks

$Picture of 100mm ERF Glass, Cell & 140mm ID Cap - For refractor$

100mm ERF Glass, Cell & 140mm 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.

696.64 €

Delivery date : 3-4 weeks

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

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.

696.64 €

Delivery date : 3-4 weeks

$Picture of 130mm ERF Glass, Cell & 150mm ID Cap - For refractor$

130mm 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.

999.16 €

Delivery date : 3-4 weeks

$Picture of 130mm ERF Glass, Cell & 160mm ID Cap - For refractor$

130mm ERF Glass, Cell & 160mm 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.

999.16 €

Delivery date : 3-4 weeks

$Picture of 130mm ERF Glass, Cell & 180mm ID Cap - For refractor$

130mm ERF Glass, Cell & 180mm 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.

999.16 €

Delivery date : 3-4 weeks