Baader D-ERF Energy Rejection Filter 180mm (12mm Glass) Baader D-ERF Energy Rejection Filter 180mm (12mm Glass) Baader D-ERF Energy Rejection Filter 180mm (12mm Glass)
Product Code: 2459246D

Baader D-ERF Energy Rejection Filter 180mm (12mm Glass)

See our Baader shop for full range of Baader products.
Manufacturer Code: 2459246D
 UPC :
Brand:  Baader
RRP: £1,474.00£1,399.00Inc VAT 20%You Save:  £75.00
Baader
The Baader Energy Rejection Filters (D-ERF) allows H-alpha solar observation  with the full-aperture resolving power of the telescope. They also dramatically reduce the thermal energy that goes through the telescope to the Solar Spectrum filter and also greatly reduces the thermally-induced seeing effects as well.

The Baader D-ERF filter-layers are designed with the utmost care. The coatings are applied with the world‘s most advanced optical coating machines, with the resultant final filters all being inspected and passed in an autocollimator on a Carl Zeiss optical bench in Germany.

To create the D-ERF filters, Baader use a 43-layer dielectric DWDM-coating which delivers a “cool”-beam of 45nm wide pure red light around the H-alpha wavelength, towards a solar H-alpha filter system. The filter glass substrate is clear BK7 glass that is of the highest homogeneity. It is fine-optically polished to the same degree of objective-lens surfaces, and the filter has all the reflection performance coatings on one side. This reflects all the unwanted wavelengths from 280 nm up to 1500 nm, but only leaving that 45nm-wide spectral window around the H-alpha wavelength. Furthermore, these Baader Planetarium D-ERF filters are coated in a way to keep the heat load on the glass as low as possible, but still ensures that it has an extremely hard, scratch-resistant coating.

Features: Baader D-ERF Energy Rejection Filter 180mm 12mm Glass

  • Objective-end filter to reduce heat during H-alpha observation with SolarSpectrum Filters
  • Plane parallel plate (without filter cell) with IR-Cut dielectric coating
  • Filters have sealed non-aging coating edges
  • Supplied as the unmounted filter only without mounting cell.
  • Available in different sizes from 75mm to 180mm

Specifications: Baader D-ERF Energy Rejection Filter 180mm 12mm Glass

  • TRANSMISSION RANGE 610 – 690 nm
  • FILTER THICKNESS (WITHOUT CELL) 12,5 mm
  • HBW (HALFBANDWIDTH) 80nm
  • CWL (CENTRAL WAVELENGTH) 650 nm
  • AR-COATING dielectrically coated, plane optically polish
  • FILTER SIZE 75mm-180 mmFILTER SIZE 75mm-180 mm
  • FILTER USAGE IR-Cut, Solar, Specialty, UV-Cut
  • FILTER MOUNTED Unmounted
  • TYPE OF FILTER Energy rejection
  • SINGLE OR SET? Single Filter
  • FILTER SHAPE round

Kit content
Baader D-ERF Energy Rejection Filter 180mm (12mm Glass)
User guide

For more information about, Baader D-ERF Energy Rejection Filter 180mm (12mm Glass) website.
Back to top
 
 
Baader D-ERF Energy Rejection Filter 180mm (12mm Glass)

zoom

Customer Reviews on Baader D-ERF Energy Rejection Filter 180mm (12mm Glass)
£1,399.00
This product was added to our catalog on Friday 24 December, 2021.