This photo of my photoalbum was taken in Okinawa.

Nikon F-mount refers to a lens mount developed by Nikon for its 35 mm SLR cameras. The F-mount was first introduced on the Nikon F camera in 1959, and features a three lug bayonet mount with a 44 mm throat and a flange to focal plane distance of 46.5 mm. The large variety of F-mount compatible lenses makes it the largest system of interchangeable flange-mount photographic lenses in history. Over 400 different Nikkor lenses are compatible with the system. The F-mount is also popular in scientific and industrial applications, most notably machine vision. The Nikon F-mount is one of only two photographic lens mounts (the other being the Pentax K mount) that were not abandoned by their associated manufacturer upon the introduction of autofocus, but rather extended to meet new requirements. This has resulted in the continued development of F-mount lenses and cameras to progressively higher levels of sophistication and automation. F-mount photographic lenses are currently made by Nikon, Zeiss, Voigtländer, Schneider, Sigma, Tokina, Tamron, Hartblei, Kiev-Arsenal, Lensbaby, Vivitar, and others. F-mount photographic cameras include current models from Nikon, Sinar, Fujifilm, and Kodak. Numerous other manufacturers employ the F-mount in non-photographic imaging applications. The F-mount has a significant degree of both backward and forward compatibility. Many current autofocus F-mount lenses can be used on the Nikon F, and the earliest manual-focus F-mount lenses of the 1960s and early 1970s can, with some modification, still be used to their fullest on all professional-class Nikon cameras. Incompatibilities do exist, however, and adventurous F-mount users should consult product documentation in order to avoid problems. In particular, many electronic camera bodies cannot meter without a "CPU" enabled lens, the aperture of G designated lenses cannot be controlled without an electronic camera body, and non-AI lenses manufactured prior to 1977 can cause mechanical damage to later model bodies unless they are modified to the AI specification. Most Nikon F-mount lenses cover the standard 36x24 mm area of 135 film, while "DX" designated lenses cover the 23.7x15.7 mm area of the Nikon DX format, and industrial F-mount lenses have varying, often small, coverage. "DX" lenses produce vignetting when used on film cameras. However, Nikon lenses designed for film cameras will work on Nikon digital system cameras with some limitations.

Because soft focus is a technical flaw, many older lenses had soft focus built in as a side effect of their construction. Newer lenses are optimized to minimize optical aberrations, but there are lenses such as the Canon EF 135/2.8 Softfocus[1] and Pentax SMC 28mm f2.8 FA Soft Lens, to name but a few, which have adjustable levels of spherical aberration at wide apertures. The effect can be disabled entirely as well, in which case the lens is quite sharp. Nikon produces a series of DC ("Defocus Control") lenses which are sometimes confused with the soft focus effect, but these are not soft focus lenses, as they do not introduce spherical aberration over the whole field. The soft focus effect is used as an effect for glamour photography, because the effect eliminates blemishes, and in general produces a dream-like image. The effect of a soft focus lens is sometimes approximated by the use of diffusion filter or other method, such as stretching a nylon stocking over the front of the lens, or smearing petroleum jelly on a clear filter or on the front element of the lens itself. It can also be approximated with post-processing procedures. Specifically, highlights in an image are blurred.