Baader Planetarium 2" f/2 Highspeed Filter Set
Baader's new f/2 Highspeed Narrowband filter sets contain H-Alpha, OIII, and SII filters and are made specifically for the sensitive requirements of exceptionally fast astrograph optics, such as Hyperstar, RASA, and extremely fast instruments from TEC, AP, ASA, etc. Ordinary narrowband filters generate a heavy loss in transmission because of the strong CWL (center-wavelength) shift. In severe circumstances, the CWL even shifts out of the FWHM (full width half maximum).
As a result, these filters have a CWL-preshift which flawlessly matches f/2 to f/3. Furthermore, the FWHM is enhanced. Despite the typical line broadening with such fast optical trains, these filters are still able to produce peak contrast. These filters permit the effective use of tremendously fast optics for maximum contrast imaging of emission nebulae for the first time. Compared with a regular set of narrowband filters, using these highspeed filters between f/1.8 and f/3.5 will exhibit drastic improvement.
Baader Planetarium Product Number: FHSS-2
- Additional Information
SKU BA-FHSS-2 Manufacturer Baader Type of Filter H-Alpha, Oxygen III, Sulfur II Filter Usage Imaging Single or Set? Filter Set Filter Size 2" Filter Shape Round Filter Mounted? Mounted Warranty 1 Year Warranty
- Included Items
- Baader 2" f/2 Highspeed Narrowband H-Alpha Filter
- Baader 2" f/2 Highspeed Narrowband O-III Filter
- Baader 2" f/2 Highspeed Narrowband S-II Filter
- Questions & Answers
Product QuestionsQuestion by: ROBERT on Aug 1, 2016 10:33:00 AMThese filters use similar substrates and glass thicknesses to be as close to parfocal as possible. But due to manufacturing tolerances and a having very shallow plane of focus (because of focal ratios being between f/2 and f/3) there will most likely be a shift between each filter. Generally speaking, when using extremely fast optics, it is a good idea to run a focus routine between each filter rotation.Answer by: Jonathan Cheek (Admin) on Aug 1, 2016 11:14:00 AMDo these filters also work well at lower speeds (e.g., 5.6,7,10), or is their performance inferior to non high speed filters at these more typical focal ratios?
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