Vivitar Series 1 90-180mm 4.5 Flat Field Macro AI-S
Verfasst: So 19. Jan 2014, 20:55
Vivitar Series 1 90-180mm 4.5 Flat Field Macro AI-S
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Technische Daten:
Focal length: 90-180mm
Filter thread: 72mm
Min. Aperture: f/4.5
Max. Aperture: f/22
Angular field of view (diagonal): 27°
Elements/groups: 18/12
Min. focusing distance: 27" (68.6 cm) @ 180mm
Max reproduction ratio: 1:4 @ 90mm, 1:2.7 @ 135mm, 1:2 @ 180mm
Weight: 2.4 lbs. ( 1.1 kg)
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Infos:
Links:
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Technische Daten:
Focal length: 90-180mm
Filter thread: 72mm
Min. Aperture: f/4.5
Max. Aperture: f/22
Angular field of view (diagonal): 27°
Elements/groups: 18/12
Min. focusing distance: 27" (68.6 cm) @ 180mm
Max reproduction ratio: 1:4 @ 90mm, 1:2.7 @ 135mm, 1:2 @ 180mm
Weight: 2.4 lbs. ( 1.1 kg)
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Infos:
Vivitar made a number of high quality zooms under the Series I label. The 90mm to 180mm f4.5 flat-field VMC lens from 1978 is an one of them.
This Vivitar 90-180mm f/4.5 lens was really designed for medical photography needs. A ring-light flash unit was designed to mount on the front of this lens too. This original medical market niche explains some of the design features and range of this high quality zoom lens.
This lens is long, and pretty heavy. It produces excellent results in macro-work down to 1:4 at 90mm and to 1:2 at its 180mm setting.
On most modern zoom lenses, macro photography settings are a lower quality setup. Achieving macro capabilities means shifting some elements and so sacrificing some of the zoom's control over spherical and other aberrations.
Most current zooms only offer macro settings at either one end or the other of their range. Only a few zooms offer continuous macro-settings over their full range. Even the better current zooms generally only get to 1:4 to 1:6 reproduction ratios (.e., the object is one-fourth lifesize on film).
The Vivitar 90-180mm f/4.5 Series I macro zoom is designed to provide the highest possible quality continuously down to its closest macro settings. The Vivitar 90-180mm f/4.5 flat-field lens provides high quality macrophotography continuously from 90mm (to 1:4) to 180mm (to 1:2). That's unique, and useful, so you should expect to pay quite a price premium for such a lens!
(Source: Cult Classics in Third Party Lenses by Robert Monaghan )
--------------------------------------------------------------------------------------------------------------Ein seltenes Highlight war das äußerlich eher unauffällige Serie 1 4,5/90-180 mm Flat Field Macro Zoom (18 Elemente in 12 Gruppen). Ursprünglich für de medizinische Photographie entwickelt, war es nach zeitgenössischen Tests das beste Zoom für Nahaufnahmen überhaupt.
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