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Changing the focusing screen allows manual focusing of SLR lenses.
If you are looking both for quality and seeking to use every possibility of picture composition, you will happily turn to "classic" lenses. Demanding photographers are increasingly asking for high-quality lenses for use on digital SLR cameras (DSLR) cameras – and manual focusing is also very welcome. This is precisely why a growing number of photographers are using Carl Zeiss SLR lenses.
Digital SLR cameras, too, are turning more frequently to sensors which image the entire 35 mm format. But in the case of many lenses, this just reveals the weaknesses around the edge of the picture. Carl Zeiss lenses have always been optimized for the entire 35 mm format and offer outstanding imaging performance across the entire image field.
Precision focusing
Precise focusing is essential if the capabilities of Carl Zeiss SLR lenses are to be fully utilized. But if you ever tried to use traditional lenses with manual focus with a digital or analog SLR camera you will know the problem: The standard focusing screens of modern auto focus SLR cameras are designed to show a bright, brilliant viewfinder image. Most of them, however, lack optical focusing aids (e.g. split/microprism screens). That makes it hard to visually assess and quickly adapt the definition of the image.
Therefore, it is worth paying particular attention to the focusing screen already fitted when using these lenses in digital SLR cameras.
Interchangeable focusing screens
A quick look through the viewfinder will tell you whether the focusing screen is “fit for the purpose”. The standard focusing screen of many commercially-available camera models is well suited for manual focusing, for example due to the fitting of a micro-prism field in the middle.
But if this is not the case, help is at hand. Camera dealers or independent manufacturers offer interchangeable focusing screens. Specialist dealers who stock the Carl Zeiss SLR range can also provide help. Information is also readily available on the Internet.
You will find focusing screens for many modern SLR and DSLR cameras at:
www.katzeyeoptics.com
www.intenscreen.com |
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December 2007 |
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