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valy

27 Aug 2019 15:29


Re: Refractor apocromat vs. Reflector newtonian?

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.. si un raport focal mai bun...Mai bun in sensul f/4-5?

Aici nu gasesti nimic interesant https://www.teleskop-express.de/shop/index.php/cat/c55_Apochromatic-Refractor.html 
 https://www.teleskop-express.de/shop/index.php/cat/c268_TS-Optics-PHOTON-Newtons.html ?