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Chroma 31mm round unmounted narrowband filters - Ha, S2, O3

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Selling my barely used Chroma 31mm round unmounted narrowband filters. Filters included are H - alpha, Sulphur 2 and Oxygen 3. All are 8nm bandpass.
These were installed in QHY filter wheel with 163M. I have imaged with them only couple of times


Asking $700. Includes PayPal fee and shipping to CONUS.

I am also selling my LRGB filter set, see my other listing for details.