NIKON 55-200MM lens
The optical design diagram for the AF-S DX VR Zoom-Nikkor 55-200mm f/4-5.6G IF-ED lens. (Source: Nikon.) A seven-bladed iris diaphragm closes to a circular aperture that produces attractive out-of-focus elements in shots. Minimum apertures range from f/22 at the 55mm position to f/32 at 200mm. Internal focusing allows use of angle-critical attachments, such as polarisers and graduated filters and the lens is threaded to accept 52 mm filters. Key features of this lens are the inclusion of Nikon’