K&F Concept 55mm lens filter adapter ring for 100mm filter system

SKU: KF05.282

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The filter holder has two slots, so you can insert two filters one behind the other. 
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Yes, there is a bag for the filter 
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Yes that works. The polarizing filters also have a rotary thread on the front where the filter plug-in system can be attached. 
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This is possible if you don't have a suitable adapter ring. However, caution should be exercised when reducing larger lens diameters due to possible vignetting. 
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I think so; As long as both parts are 100mm wide, the brand doesn't matter. 
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Gradient color in the glass.It is quite a high quality piece. 
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The size of the adapter ring depends on the size of the filter thread of the lens used. This is noted on the lens and in the lens cap.