Macro lenses are designed to focus much closer than a normal lens. This can create some problems photographers need to be aware of with respect to camera-to-subject distances and the risk of blocking ...

‘Collimating’ refers to the process of accurately aligning light or particles in a parallel manner. When used in light measurement applications, collimating ensures that the propagating light exhibits ...

The collimating lens has a diagonal full field angle of 65°. The aperture stop is positioned on the first surface of the lens, with an aperture stop size of 10 mm and F-number of 2.046. The angular ...

The latest lens developed by Sigma for its DC range for cropped sensor cameras (APS-C sized sensors) is this fast standard zoom with close focus capability. With a focal length range of 17-70mm and ...