In the Academy of
Sciences astro photographers circle he was not previously active, even more
warmly now our "Welcome". On 7 July this year, he managed the mosaic
of an interesting area to a large sunspot group (AR 1785). He used a Meade
Refractor (ED 152 mm with 3x Barlow lens) and as a DMK camera 21AU618.AS. At
3657 mm effective focal length (aperture 24) the frames of the video sequence
were exposed to 0.2 ms.
