?? ?? ?? ??? ???? ???? ??????? ???? ?? ??? ???, ???? ?? ?? ???? ???? ?? ?????? ?? ???? ????????? ??? ??? ??????? ?? ??? ????????? ?? ???? ???.   ???????? ?? ???????? ???? ????? ??????? ??? ??? the ideal is nonexistent. It is suited to use if it has the ISI mark. If two brand names both equally point out Fe 500/Fe500D, then They're both of those