The Nikon F-Mount was launched with the Nikon F camera in 1959 and has remained virtually unchanged since, making it the only lens mount still in production over 5 decades after its introduction. The camera mount comes essentially in 3 flavors: F, AI-S and AF, with some minor adaptations for particular cameras, mostly the digital entry-level models, which feature 2 extra screws and the minimum aperture confirmation notch, discussed later on.
Review of the ASP 18-200mm f/3.5-6.3D IF DC Sigma: You can’t have at All.Strengths, weaknesses, competition and pro reviews. In spite of its optical flaws, still quite respectable for an extreme zoom at this price point.
Review of the APO 100-300mm f/4D EX DG HSM Sigma: Sharp, even at f/4, excellent construction, great value for money.