Summary. This lecture was about very specialized area of astronomy, so we will writte just basic problems. The main problem were filters for photometry, what sorts there are, what are the advantages and disadvantages of each sort and how to solve the problems connected with those.
The more interesting part were questions and a theme were big and small science. The answers were very optimistic - all astronomers have part in development of science, small observatories can make less complicated measurements while big ones the big ones.
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