I quantified the extracted DNA on Multiskan Go. The provider of the instrument directed me to take the absorbance at 260 and multiply it by 1000. According to him this would give the concentration of DNA in ug/ml. I read somewhere else that it is actually the difference in A260 and A320 which is then multiplied by dilution factor and in turn multiplied by 50 which will give concentration. Could someone tell me what is the correct way and if later is correct then what dilution factor is he referring to?