Pentax K-mount lenses. http://en.wikipedia.org/wiki/Pentax_K_mount#List_of_Lenses_with_any_K-Mount_Variant
No as long as they have the correct mount.
Yes, a Nikon F-mount bayonet will fit a Nikon D80 camera. The D80 is compatible with all Nikon F-mount lenses, allowing you to use a wide range of both autofocus and manual focus lenses. However, certain features, such as autofocus, may not work with older manual focus lenses. Always check for compatibility to ensure optimal performance.
Pentax is not a certain type of photography, but is actually a company that makes high quality cameras and camera lenses. Pentax camera users are typically professional photographers or are very serious about photography. There are several Pentax gallery communities that host archives of photos that fit into all types of categories.
Both are excellent cameras. The Sony is a continuation of the Minolta camera legacy, and all Minolta DSLR lenses (and some film lenses) will fit most Sonys. Nikon has probably the broadest range of available accessories; one major online vendor carries over 200 different Nikon lenses. If you plan to get into photography in a big way, Nikon is probably the best bet. Otherwise, either will do a good job for you. The writer is unbiased, as he uses Pentax cameras.
No, Canon lenses are not compatible with Nikon cameras. Canon lenses are designed for Canon cameras, while Nikon lenses are designed for Nikon cameras.
Generally, no. Each manufacturer has proprietary mounts for their lenses and, for example, Nikon lenses will not fit a Canon and so on. There are aftermarket lenses made to fit various cameras, but you need to specify the make and even sometimes the model of the camera in order to get a mount that fits.
No, Canon lenses do not fit Nikon cameras. Canon lenses are designed for Canon cameras and use a different lens mount system than Nikon cameras.
Pentax screwmount lenses (M42) will fit differently branded cameras with the same mount. It will easily fit other camera mounts including digital bodies using a cheap adapter. Just make sure you use the correct version of the adapter that focuses correctly to infinity. With Pentax K-mount lenses, there are existing adapters that will mount these to a four/thirds system camera, the Canon EF EOS, the Minolta MA or Sony Alpha and the Leica M39 screw mount. Take note that in most digital bodies, the lens can only be used at manual mode. Some camera models will not meter through it even at stop down. Pentax dSLR bodies will meter through them and add Shake Reduction and focus confirmation even if the lens is full manual.
No, a Canon lens will not fit on a Nikon camera because they have different lens mounts.
No, a Canon lens cannot fit a Nikon camera because they have different lens mounts.
nope