251 Zoom lenses compared!EBSCO_AspPopular Photography
The encoded objective nosepiece Z, 2x cod, accommodates two objectives, and a variety of high-quality lenses (PlanApo Z, Apo Z, PlanApoFluar) and eyepieces are available for the AxioZoom V16.The microscope body is equipped with apochromatic optics and a motorised zoom that features eZoom ...
R8(价格待定;2008年3月7日上市)之后推出的全新款式,配备7.1倍广角变焦镜头、1000万像素CCD的高分辨率和平滑图像引擎III,机身更同时兼顾操作性和便携性。 ricoh.com ricoh.com [...] while already in the digital zoom region, the zoom will automatically move to ...
It should be pointed out here that it is customary in the prior art of zoom lenses of such a type as in this embodiment that for an equivalent zooming range, the first lens unit is constructed with more than four lens elements. In the embodiment of the invention, however, the introduction...
In the field of zoom lenses for photographic cameras or video cameras, an increasing number of ones in which a lens unit other than the first, when counted from the object side, is moved to perform focusing, or which employ the so-called rear focus type, have been proposed. ...
The zoom lenses including focal lengths of from the wide-angle to the telephoto region are known in, for example, Japanese Laid-Open Patent Applications No. Sho 57-164710 and No. Sho 60-39613. In these publications, zoom lenses composed of five units of plus, minus, plus, minus, plus,...
In order to attain a compact zoom lens having a high zoom ratio, refractive powers of movable lenses are increased and intervals between lenses are shortened as a usual method. In the zoom lens described above, the compactness is attained by the above construction, the loci of movement and ...
In addition, the zoom lenses are expected to have wide field angles and high zoom ratios. An example of the zoom lens that meets the above-described demands is a four-unit zoom lens, which has four lens units, namely, in order from the object side to the image side, a first lens uni...
lenses of the second lens unit L2 if the second lens unit L2 includes a plurality of negative lenses, a focal length of the positive lens G2P (f2P), a focal length of the second lens unit L2 (f2), a thickness of the positive lens G2P on an optical axis (2P), a thickness of ...
Further, zoom lenses having an image stabilizing function are also known. In the zoom lenses, image blurring caused when vibration is accidentally transmitted to an imaging system is compensated by moving some of the lens units perpendicularly to the optical axis. ...