Antlia 3nm SII Pro Series Filter - 2" - SII-PRO-3NM-2 Bresser To demonstrate just one of

To demonstrate just one of the effects you will see

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Antlia 3nm SII Pro Series Filter - 2" - SII-PRO-3NM-2 Bresser To demonstrate just one ofThis very narrowband 3 nm SII filter from Antlia is part of their Pro series and comes in a 2" threaded filter cell that is designed to be screwed on to the 2" receptacle of your astrophotography accessory, including a 2" filter wheel or filter drawer. Antlia 3nm Pro Series Sulfur II Filter 2" Mounted This Antlia SII Pro narrowband filter optimizes the FWHM (full width half maximum) to a 3nm bandpass. As the bandwidth becomes narrower, the 3nm Pro