ASTROPHOTOGRAPHY – The Sun / sunspots 2797, 2798 and 2799

Below, the small sunspots designated AR2797, AR2798 and AR2799. The latter has the particularity of being the first in the Northern hemisphere of the Sun for the last 2 months. This is a one-shot exposure of 1/3200s at ISO 100 on an APS-C CMOS sensor through a 85mm f/5.3 refractor (Takahashi FSQ85) with a visible light sun filter (transmission 0.01%).

The sun filter is a Mylar sheet (a form of dimensionally stable thin plastic) powdered (probably) with aluminium to block 99.99% of the light of the Sun and allow observation of sunspots.

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