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The Rodenstock 100mm f/5.6 Apo-Sironar-S Lens is a 6x9 format lens for universal use which has been modified to provide the highest image reproduction quality. Like the Apo-Sironar-N, its applications are practically limitless. Its special strengths can be seen when complex, fine structures in the adjustment range have to be reproduced.
The angle of coverage of the 100mm Sironar-S is a whopping 75°, permitting generous shifts of at least 28mm in the 6x9 format. This allows more control over the large format image, and less limits upon the creative capacity of the photographer. Despite the broad coverage, it is still a very small lens with a compact rear barrel to permit its use upon small 6x9 system cameras.
Today's modern fully-multicoated lenses for large format film cameras available from the 'big four' are all so good that for the most part they're practically interchangeable. Perhaps it has been more important to consider the lens' dimensions in relation to your camera's limits, or perhaps collect lenses based on a shared filter size. But in the tried and true 6-element, 4-group standard lens formula, the Apo-Sironar-S stands head & shoulders above the rest thanks to its ED glass. This lens stuns at ideal apertures like any of the modern 6-element/4-group lenses will, but it is at the apertures which are far from ideal in the world of large format where the Apo-Sironar-S justifies its superior performance claims. While you might be disappointed with a skillfully-crafted effort at f/11 with another "normal" 6-element/4-group lens, the Apo-Sironar-S will still impress. Indeed, f/11 is within its recommended shooting aperture range.
A compact, extremely sharp standard lens for the 6x9 format
Increased coverage (to 75°) for the classic 6-element, 4-group optical design
Use of extra-low dispersion (ED) glass allows for no visible color fringing, even at edges
Brighter ideal working aperture range of f/11-22 allows shorter exposures and sharper outdoor images
Weighs just 6.7 oz (190g) and has very small 31.5mm rear outer barrel to allow use of small camera lensboards
Maximum image circle of 155mm allows ±28mm of rise/fall/shift (in both vertical/horizontal composition) for 6x9 format
Accepts 49mm filters
Standard-style Copal #0 shutter with calibrated aperture scale and maximum 1/500th speed