Dobrý den, aniž bych se vás chtěl dotknout, z popisu jsem zmaten. Na začátku píšete, že se jedná o refraktor, a to asi bude správně. Dále je uvedeno, že jde o dalekohled čočkový, což je sice totéž, ale refraktor je správnější. Čocková je kaše nebo polévka. Abych se dále dočetl, že Newtonova systému, což je ale reflektor. Jde o dalekohled 90 x 900 a v poisu vám najednou naskočí údaje od dalekohledu 120 x 900 a dorazíte mě informací, že má aperturu 130 mm. Antireflexní vrstva opravdu, ale opravdu nemá vliv na chromatickou aberaci, ale pouze omezuje ztráty světla odrazem mezi optickými prostředími. Chromatická aberace je korigována tak, že optický člen je složen z kombinace spojných a rozptylných čoček z korunového a flintového skla, čímž jej lze vykorigovat, aby měl přesnou fokusaci ve dvou částech spektra - achromatický, či ve třech č. spektra - apochromatický. Takže váš popis je vnitřně rozporný, ale chybí mi informace o materiálu stativu a jeho tuhosti. Kov nebo plast?
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