Baader Planetariun D-ERF Solar Filter with IR-Cut – No Cell – Diameters 135 mm

Baader Planetariun D-ERF Solar Filter with IR-Cut – No Cell – Diameters 135 mm

Description:
The Baader D-ERF (Dielectric Energy Reflection Filter) is designed to block harmful infrared radiation before it reaches your optical system during solar observation. It acts as a front-mounted pre-filter when used in combination with H-alpha filters like SolarSpectrum. Its advanced dielectric IR-Cut coating and perfectly flat, parallel faces ensure thermal reduction and image clarity.

The D-ERF filter must always be installed at the front of the telescope, oriented correctly as marked on the edge of the filter glass. It is delivered without a mounting cell and must be inserted into a compatible filter holder.

WARNING: The Baader IRF filter must only be used together with a complementary H-alpha filter. Using this D-ERF filter alone for solar observation or astrophotography can cause severe and irreversible eye damage.

Technical Specifications:

• Coating: Dielectric IR-Cut

• Half-bandwidth (HBW): 80 nm

• Type: flat and parallel faces

• No mounting cell

• Made in Germany

Available sizes and models:

• BA-2459241D: 5.0 mm thickness / Ø 75 mm ± 0.05 mm

• BA-2459242D: 6.0 mm thickness / Ø 89.9 mm ± 0.05 mm

• BA-2459243D: 8.10 mm thickness / Ø 109.9 mm ± 0.05 mm

• BA-2459244D: 9.10 mm thickness / Ø 134.9 mm ± 0.05 mm

• BA-2459245D: 9.90 mm thickness / Ø 159.6 mm ± 0.05 mm

• BA-2459246D: 12.5 mm thickness / Ø 179.9 mm ± 0.05 mm