http://www.nikonchat.com/nikon-d50-lenses-compatibility/

A question about the Nikon D50 and the compatibility of the lens?
Can anyone please tell me what photo Sigma Lenses can be used Nikon D50 digital camera? I want to do macro photography, and many shops do not have Nikon macro lens, but I have seen many Sigma lenses and need to know which are compatible w / the D50.
Any Sigma lens has a Nikon lens mount is compatible with the camera. Sigma is a highly respected manufacturer of "independent" and manufacturing Lens of them for the usual range of lens mount (Nikon, Canon, Pentax., Sony / Minolta). Later. I have seen comments based on their exposure Nonoy may experience Sigma lens problems. I've been involved with photography for almost 50 years and have never seen a statement before, despite the regular reading of the photographic press. The exhibition is a function that is calculated by the camera and the lens has nothing to do with it, other than to allow light to reach the cell or cells by the calculations