2017 November 23 Sun - AR12687
Seeing is better today, but extensive clouds interfere with observation. My observation is also frustrated by the failure of the oven controller, making the temperature of the filter fluctuates, resulting in off-band of my filter.
AR12687 is reduced to patches of plages and filaments. No sunspot is visible.
Telescope: AP Starfire EDT 155 mm f/9.
stopped to 50 mm (f/28) for disc images, with 4X telecentric lens (f/36) for closeups
filter: Solar Spectrum SO1.5/0.3A with CERF prefilter
Camera: Imperx 4M15
2017 November 23 Sun - AR12687
2017 November 23 Sun - AR12687
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