I find it simply amazing what I can learn here on this list! Thanks, knowledgeable people! And having buttered you up thusly, a few more questions. Okay? (I'm starting to feel like a pest...) 1] A Tamron Adaptall mount is required to mount certain Tamron lenses (like the 24mm f2.5 MF) to a Pentax k-mount. Okay. But then, what's a ka-mount? And which do I need for a Tamron Adaptall to a Pentax ZX series camera? 2] Also, what brands of lenses are the following mounts used for: T-mount to Pentax K? C-mount to Pentax K? (I think I know what the Universal mount to Pentax K is. A mount for the older Pentax screw mounted lenses to go onto a k-mount, right?) Thanks again for your assistance, Skip - 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 .