[TakMan (Kyle)]

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Baader Planetarium 7nm H-Alpha Filter 2"

List price in AU is $399. You can have this one $280 New in the Box.
Reduced to $200

Factory info:
Baader Planetarium 7nm H-Alpha Filter - 2" Features...
* Delivers the absolute highest contrast deep sky images of H-II regions, with the shortest exposures possible

* Its narrow 7nm FWHM bandwidth has a transmission at H-Alpha of over 90%, while completely rejecting light pollution

* The high optical quality of the Baader 7nm H-Alpha filter guarantees no loss in sharpness or contrast

* Each substrate is fine-optically polished plane parallel to deliver a smooth and accurate 1/4 wavefront over the entire surface

* This special custom polishing operation sets Baader filters apart from the standard commercially precision polished filter substrates used by most other filter manufacturers

* Coatings are professionally applied by the most sophisticated equipment available, ensuring high consistency for bandpass centering and transmission

* The ultra-hard ion beam deposition ensures the coatings will never degrade from use or normal cleaning

Baader Planetarium 7nm Ha 2" Astrophotographic Filter Specifications...
Filter Type : Photographic - Hydrogen Alpha

Bandpass : 7 nm

Size : 2" Style : Round, threaded cell

Transmission : 90%