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To the best of my knowledge, most, if not all, Sigma lenses fit most cameras that use interchangeable lenses with the appropriate adapter. As I recall, Sigma uses a bayonet mount and adapters are available for many name brand cameras. For example, I have a Nikon and my Sigma 600mm came with an adapter for a Canon. All I had to do was order a Nikon adapter. If you're not sure, you might want to check with a local camera store to confirm which adapter you need.
Sorry, no. If it fit onto a Pentax camera then the lens has a Pentax mount. The Nikon (I assume you mean the D80 digital camera, or perhaps the N80 film camera) has a Nikon mount. Since the Nikon mount has a deeper flange distance than the Pentax mount, there are no adapters available to allow you to fit a Pentax-mount lens onto a Nikon camera.
No. The Nikon F mount has a longer flange focal length than the Pentax K. What this means is that a lens adapter to fit a K mount lens onto a F mount body would have to have a negative thickness, which is a bit difficult to build with current technology. Adapters going the other way are possible and available.
You need a T-mount ($30) for a Canon on E-bay or a big camera store. There is NO connections to the camera body, so you have to turn off auto focus and go to "Auto" mode (the shutter speed will change) as the lens is fixed at F8. The mirrors give very little depth of field, 4 or 5 feet when far away but everything in back is a blur of circles. At F8 the shutter speed can go slow and at 600mm you may need a tripod.
There is a ring you must remove then you will have to
soften the silocon we use aceton but you must be very
carefull DONOT lever out the elemet just turn over the
lens and bang it on the table a few times and the front
element will fallout with luck
You may be able to find a Konica toMinolta or Konica to M42 adaptor. Some adaptors are available...some aren't; it depends upon the film plane dist. and mount diameter. For instance you can get a Nikon to Canon adaptor, you can't get a Canon to Nikon adaptor. Email KonicaMinolta and ask them.