Let me add an interesting "tid-bit" regarding Promaster......I picked up one recently for a beach vacation. Didn't want to take my nice glass. Looking over my Exif data, it shows the promaster 28-105mm zoom as "SMC Pentax-FA 28-105mm F 4-5.6 (IF)" Interesting as I always thought promaster was supposed to be re-branded Tamron. Oddly enough, the lense still produced some nice shots that I posted elsewhere on this forum.
http://www.pentaxforums.com/forums/p...688-maine.html
Mark