The Baader f/2 Highspeed-Filter O III-31mm reveals a level of intricate detail that rivals the best deep sky photographs, the Baader through a very sharp and narrow completely blocks longer and shorter wavelengths, this is why some O-III filters appear red, instead of the correct 500 nm free. Baader balances each dielectric coating stack to avoid the ghosts and annoying halos that plague other mfgr's filters. Unlike most aperture, in order to minimize vignetting special threading has been designed to fit the wide variety of eyepieces and accessories (there is significant variation between the 1¼” filter threading used by eyepiece and accessory manufacturers). The front 'crown' of the filter incorporates milled notches which make handling and threading the filter a more secure operation in the dark.
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