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Since you already have a Quantaray lens, you should know that Quantaray makes lenses with a variety of mounts. A lens with a Pentax mount won't fit a Canon camera, for example. As long as you get the lens with a Canon mount it will fit the XTi just fine.
One of the great things about Pentax's digital cameras is their lens compatibility: You can use any Pentax lens made since 1975. But the functionality varies from the oldest lenses to the newest. This guide shows what features work with each lens series and what to beware of when buying third-party lenses.
Absolutely. Pentax only guarantee compatibility of their cameras with their own lenses as long as they're contemporary to the model you're using.
Other manufacturers make lenses which will physically fit your camera, but now that all communication between the body and lens is electronic they're not always fully compatible especially as the camera manufacturer often changes the technical specifications.
Check with Tamron: it's not unusual to have to send your lens back for an update to ensure compatibility with the latest models.
Which type of lens mount, what digital camera. Nikons will fit older Nikon lenses. Canon it seems only fits AF lenses Olympus digital only takes their own new mounts. Minolta lenses will fit the new Sony/Minolta digitals. Pentax digital will take any K-mount or older thread mount. Need to change some menu setting though. Need a K to 42mm for the thread mounts. Mounts are all different, so a Canon won't fit a Nikon, Sony or Pentax and vise versa.
Congratulations on the aquisition of such a great vintage camera!
Pentax cameras use a mount known as M42. This means it is a 42 millimeter diamater. You may also find this referred to as the Pentax mount, as Pentax (Asahi Optical) made this popular in the United States. With any camera, any lens you purchase should match the mount of the camera in order to be used together.