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| 15.06.2014 sun in H alpha light , taken with ZWO ASI120MM CCD camera by Lunt LS60mm + Double Stack filter, with Shapley lens at f = 250mm shortened, 30msec exposure time per frame, 164 v. 411 images with Autostakkert summed, Harpoint observatory the short-exposed shot the previous page was combined in a photomontage with this long-exposure shot. With this trick the extremely large Arcuate protuberance is visible. Visually, it was difficult to see. Only using both etalons were the brightest off-hook structures are seen. Only the camera image reveals the entire structure here.The dark ring between two images could have been avoided with intermediate exposure times (HDR method)
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