Faa'iidada 1. Iftiin: Cufnaanta muraayadaha guud ee lenses waa 0.83-1.5, halka muraayadda indhaha ay tahay 2.27 ~ 5.95.2. Iska caabin xoog leh: Iska caabbinta saamaynta lens resin guud ahaan waa 8 ~ 10kg / cm2, waa dhowr jeer muraayadda, sidaas darteed ma fududa in la jebiyo, ammaan ah oo waara.3. Gudbiyaha iftiinka wanaagsan...
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