Stupid Q. - Lenses across different cameras?
OK...I'll try to keep this question short.
I have a K100D that I'm about to upgrade. My sister has coveted a dslr for a long time...she's an old-school Nikon 35mm user from her college days.
I was going to give her my K100D body as a present when I upgrade. I thought it would be nice if I could give her a lens to use on my body that she could also transfer to a Nikon body if she ever decides to go Nikon down the road.
Do any of the 3rd party lens makers make lenses that will work on Pentax and Nikon? Or if you buy it for one system will it NOT work with any others?