args[0]=message
args[1]=DB::DB::Message=HASH(0x43434b0)
Re[8]: Kosmicheskii teleskop "Habbl"
9.08.2007 13:38 | Dmitrii Docenko
> Znachit li eto, chto znachitel'naya chast' ploshadi zerkala prosto ne ispol'zuetsya, t.k. zakryta shel'yu?
Net. Zakryta znachitel'naya chast' fokal'noi ploskosti.
> Pochemu zhe togda imenno dlya spektrometra ne proyavlyaetsya ta nepoladka, kotoraya yakoby meshaet Habblu delat' kachestvennye UF-snimki?
"Nepoladka", tochnee, prisutstvie korrektiruyushego fil'tra, proyavlyaetsya v umen'shenii effektivnoi ploshadi, a ne uhudshenii uglovogo razresheniya. Kartinki ne stanovyatsya "razmazannymi", no pri tom zhe vremeni nablyudeniya men'she znachenie "signal/shum".
Na oba etih voprosa est' otvety v moih predydushih pis'mah. Samocitaty:
"Vmesto etogo fokal'nuyu ploskost' mozhno zakryt' neprozrachnoi plastinoi, ostaviv v nei tol'ko nebol'shuyu dyrku (obychno ispol'zuetsya shel', no ee mozhno predstavit', kak summu nakih dyrok)."
"Razreshenie u UF snimkov/spektrov otlichnoe. Effektivnost' malen'kaya."
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