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This Series I lens provides a wide angle to short telephoto capability in a lens only 3.6 inches long that weighs only 26 ounces. Like its cousins, this Series I lens features a short ten inch close focus range providing a 1:3.5 reproduction ratio. What is more important is that the lens is very sharp throughout this range, with excellent contrast too (thanks to VMC multi-coating). Again, the lens is large in diameter, requiring a 72mm filter, but providing a reasonably fast f/2.8 constant aperture throughout its range.
How could Vivitar provide optimal sharpness with such a zoom in the late 1970s that still holds up to the professional standards of the 1990s? The answer lay in abandoning true zoom action, and substituting a vari-focal zoom. With a vari-focal zoom, you have to re-focus the lens every time you change the focal length. But this trick frees the optical designer to maximize the lens sharpness and quality.
The late Dr. Rudolf Kingslake remark in his book " A history of photographic lens 1989" that
- " the image quality of this lens was fully comparable with that of a normal fixed lens of the same aperture and focal length "
Oczywiście dzisiejsze szkła mają lepszą często ostrość, lepiej pracują pod światło, no i czasem mają lepszy bokeh, w dodatku konstrukcja vari jest dość męcząca w użytkowaniu, ale jest to szkło nadal warte kupienia, choćby ze względu na świetną konstrukcję mechaniczną.
starocie: xg-9 xg-m xd-7 17/3.5 24/2.0 2x24/2.8 28/1.9 28/2.0 28/2.5 35/1.8 35/1.9 45/2 50/1.4 58/1.4 60/4 85/1.7 105/4 135/2.8 135/3.5 35-85/2.8 70-210/3.5 i inne
Dołączył: 06 Sty 2009
