MalVeauX Posted March 4, 2021 Share Posted March 4, 2021 (edited) Heya, It rained yesterday but was clear this morning today, so I had a chance to look at AR's 2806 & 2807. They're small active regions, with tiny sunspot pores, no visible penumbra developed on either, but lots of lovely plage and filament activity between their poles. Took a look at them in HA, CaK & the Photosphere with a 100mm aperture. Seeing was not great, it was spiking 1.5 to 2 arc-seconds, so the HA is sampled well but the CaK is under-sampled. The HA is higher contrast due to double stacking a custom 1.7A blocking filter (from Apollo Lasky) with a 6A blocking filter together in a Skybender, despite being a single stack etalon imaging train to get near double stack performance levels of contrast. B&W: https://flic.kr/p/2kH371N Equipment: 100mm F10 Achromatic Doublet Refractor + Internal 50mm Baader Red CCD-IR Block Filter (D-ERF) + PST Etalon + Skybender with 1.7A BF & 6A BF Double Stacked + IMX290 (HA) + Internal 50mm Baader Red CCD-IR Block Filter (D-ERF) + Baader ND 3.0 Filter + IMX290 (Photosphere) + Internal 50mm Baader Blue CCD-IR Block Filter (D-ERF) + Lunt CaK B1200 Module + IMX290 (CaK) Very best, Edited March 5, 2021 by MalVeauX 1 Quote Link to comment Share on other sites More sharing options...
MarkAR Posted March 5, 2021 Share Posted March 5, 2021 More excellent sun shots, love the curly prom. 1 Quote Link to comment Share on other sites More sharing options...
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