[EMAIL PROTECTED] said: > Certainly not. According to Pentax KAF3 patents, both IS and USM will > work without sacrificing compatibility.
IS=Image Stabilization, but what is USM?
[EMAIL PROTECTED] said: > Certainly not. According to Pentax KAF3 patents, both IS and USM will > work without sacrificing compatibility.
IS=Image Stabilization, but what is USM?