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Auch wenn es eigentlich hier nicht Thema war, hier aus gleicher Quelle etwas zum Thema Schutzfilter:
When to use a UV filter
Finally, a few points on the use of UV filters: these are used to block out ultraviolet light, yet they remain transparent and fully permeable to visible light. In certain situations where there is a high proportion of UV light (for example at high altitudes), the image contrast can be slightly increased and the sharpness enhanced by filtering out undesired wavelengths. As a result, colors appear more radiant. T* UV filters do not lengthen the exposure time, which makes them ideally suited for everyday use, particularly for protecting the front lens from dirt, dust and scratches, and even from slight damage if the lens is dropped.
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