</span><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE (erose54 @ Feb 7 2003, 12:33 PM)</td></tr><tr><td id='QUOTE'> Pardon my ignorance, but what does 1-2-2-1 etc mean? </td></tr></table><span class='postcolor'>
I think it means 4 lens groups, with 1 element in the first group, 2 elements in the second and third, and 1 element in the fourth. So there&#39;s a total of 6 elements on them, in 4 groups.