It's optically an excellent lens. I have several and have tested it. It's got the best dust seals of any lens I own. Autofocus is really not bad...it's fun to use. Converts a manual focus camera to autofocus (& keeps the split screen!). Robert James In a message dated 7/18/01 5:27:20 PM, [EMAIL PROTECTED] writes: << Date: Thu, 19 Jul 2001 01:58:44 +0200 From: "Jaros3aw Brzeziński" <[EMAIL PROTECTED]> Subject: Re: Tamron 70-210 F4 IF I vaguely recall that Tamron did make such a lens in early autofocus era (around 1988 - it is just a guess) but very shortly gave it up. I don't know about the optical quality of this lens but I heard that AF- wise it was a disaster - slow, loud and hunting a lot. The lens contained both a large motor and autofocus sensors and was thus heavy and cumbersome. I would rather say - stay away from this lens. >> - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .