ВНИМАНИЕ! На форуме начался конкурс - астрофотография месяца СЕНТЯБРЬ!
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Сделали полезное дело- сравнили корректоры комы. Хорошо
Ребят, вот только мессье 15 ну никак не в Дельфине!!
RE: Focal Ratio's of telescope for use with Lumicon UHC and O-III filtersHi Alexandr http://www.lumicon.com/store/pg/15-LUMICON-Nebula-Filters.aspxThere is a section in the middle of this page on the discussion of the optimum exit pupil value for a given telescope filter combination. It tries to match the telescope's exit pupil to the human eye's exit pupil. This is a more accurate description than just f/. It is a little complicated but this is a more exact way of matching telescope f/ number, the eyepiece you are using and indirectly telescope size for maximum performance of our filters.