D-ERF Energy Rejection Filters View larger

D-ERF Energy Rejection Filters

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Never use any eyepiece filter for solar observation without a Solar objective front filter. 

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Delivery In 1-5 Days*

280.00

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Only one filter supplied.

The D-ERF filters are plane-parallel circular disksboth surfaces are precision optically polished, an infrared-reflective coating (layered system with many individuallayersprevents the penetration of heat into the telescope tubeThe blocking of IR (heat radiation) holds the D-ERF filter plane-parallel even with longer observation times.

Only the best quality raw glass is used in the production of these filters, this ensures that the final product is able to cope with the stresses of solar use, whilst ensuring fantastic images and crystal clear observing. Above all, the D-ERF filter protects the expensive H-alpha filter, whilst in focus, against premature aging caused by heatstress.

Baader Planetarium filters are coated using ion-beam systems to keep the heat load on the glass as low as possible and still ensure an extremely hard, scratch-resistant coating.

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