LONG FOCUS - A lens of relatively long focal length with a narrower angle of view than a normal lens, but with a more enlarged view of the scene.
Use a Long Focus Distance: There are two ways of using your camera to select the focus distance. Both of them are effective and the choice is a personal one.
Long focus - a lens in which the focal length is much greater than the diagonal of the film format with which it is used.
Low key - photograph in which tones are predominantly dark and there are few highlights.
At long focus distances, the X100's Fujinon 23mm F2 lens performs very well. At F2 it's impressively sharp in the center of the frame, and this sharpness holds up pretty well to the 'short' edges of the frame.
The long focus CC-401 is desirable for portraits and product photography, while the wide angle CC-402 is a rather remarkable camera.
This variant is so named because it often is produced through use of long focus or telephoto lenses. Again, however, the lens doesn't cause the distortion.
I have to warn you though, it has a long focus/shutter delay compared to recent compacts; no fisheye capability, but takes a WA lens. The oly 5050 has a much better lens. The best photos I've ever seen from compacts are from an Oly 5050.
Lens barrel: Housing for all the elements of the lens.
Long focus lens: Lenses with focal length greater than the diagonal of the film format it covers.
Low key: Pictures composed mainly of dark tones.
A small depth-of-field can seperate a subject quite easily from the surrounding but sometimes this is no option because we either operate at very long focus distances or we simply want to include a sharp focused environment in the scene.
Camera shake
Unwanted movement of the camera, caused by a wobbly hold or support. It is a major reason of unsharp pictures, particularly with long focus lenses.
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Lens in which some (usually two) of the elements are curved mirrors. This construction produces comparatively lightweight short fat long focus lenses. They cannot be fitted with a normal diaphragm.
MTF ...
(Some lenses have very long focus ranges so having a focus limiter to tell the camera how far away the subject likely is helps to make focusing faster, versus having to hunt through the entire range.) ...
-Camera shake - movement of the camera caused by an unsteady hold or support. It is a major cause of un-sharp pictures, especially with long focus lenses.
Depressing the shutter release button half way is the absolute best way to reduce shutter lag because the camera can actually take the photo at the time you want the photo taken because the long focusing process is already complete.
Movement of the camera caused by an unsteady hold or support. A notable problem in a moving vehicle such as a helicopter or fixed wing aircraft. It is a major cause of un-sharp pictures, especially with long focus lenses.
Capacity: ...
Lens of relatively long focal length designed to provide a narrower angle of view than the normal or standard lens, which generally has an angle of view, expressed on the diagonal of the film format, of about 45 degrees The long focus lens thus ...
Remember that you focus at working aperture (f/2.8 in the example above). At long focus distances the defect will be compensated by the increased depth-of-field but expect focus errors at closer focus distances. Some ultra-wide and wide angle ( ...
Mirror lens (Reflex Lens).
Lens in which some (usually two) of the elements are curved mirrors. This construction produces comparatively lightweight short fat long focus lenses. They cannot be fitted with a normal diaphragm.
Autofocus lenses with geartrains (ie: ring USM lenses excepted) require a bit more looseness and play in the geartrain system. They also don't usually use long focussing helicals as that would take more battery life and time to focus.
 See also: Focus, Image, Lens, Camera, Lenses
  
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