Iiteleskopu eziphinda-phindayo ziye zagxekwa ngenxa yentsalela ephezulu yechromatic aberration kunye nespherical aberration, kwaye imeko yobude obufutshane bogxininiso imbi kakhulu kunobude obude bokugxila. I-4-inch F / 6 achromatic refracting mirror isenokuthi ibonise ukusasazeka kombala ongenakungahoywa (ngokuqhelekileyo kuya kubakho i-halo emfusa kufuphi nezidalwa zasezulwini eziqaqambileyo), ngelixa i-4-intshi F / 16 kuphela Kuya kubakho ukusasazwa okuncinci.
Kwizibuko ezibonisa i-diameter enkulu kakhulu, kukwakho ingxaki yokutshona kwelensi, nto leyo esisiphumo sobunzima bomxhuzulane obangela iglasi. Iziphene zeglasi yingxaki eyongezelelekileyo, amaqamza omoya okanye imigca evaleleke kwiglasi. Ukongeza, iglasi i-opaque ukuya kumaza athile, kwaye ukukhanya okubonakalayo kuya kuthotywa kukufunxa kunye nokuphinda kuqhawuke xa ungena kwaye uphuma kujongano kunye nokungena. Uninzi lwezi ngxaki lunokupheliswa okanye luncitshiswe ngokutshintshela kwizibuko, kwaye i-diameters enkulu inokuveliswa.
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