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![2020 NEW] Optolong L-eXtreme dual-band astronomy narrow band filter-Optolong Optics Co.,Ltd.](http://www.optolong.com/uploads/images/20201221/c9c1eceae882aa30c5c38282698d6525.jpg "2020 NEW] Optolong L-eXtreme dual-band astronomy narrow band filter-Optolong Optics Co.,Ltd.")
2020 NEW] Optolong L-eXtreme dual-band astronomy narrow band filter-Optolong Optics Co.,Ltd.
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![2020 NEW] Optolong L-eXtreme dual-band astronomy narrow band filter-Optolong Optics Co.,Ltd.](http://www.optolong.com/uploads/images/20200716/5bcdb1e79c79231df851f9b60f152ba9.png "2020 NEW] Optolong L-eXtreme dual-band astronomy narrow band filter-Optolong Optics Co.,Ltd.")
2020 NEW] Optolong L-eXtreme dual-band astronomy narrow band filter-Optolong Optics Co.,Ltd.
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ZWO Duo-Band Dual-Bandpass Narrowband Imaging Filter - 2"
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