18 Pieces Filter Ring Adapter Set, Camera Lens Filter Metal Stepping Rings Kit (Includes 9pcs Step Up Ring Set + 9pcs Step Down Ring Set)

SKU: SKU0629

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No, the rings are intended to adapt filters and other light weight accessories on the camera lens. 
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No, The filer ring sets in general are for the weight of a filter and not intended to support a lens. Also you may alter the focal length with ring adaptors used in this way. T rings are common for adapting a off brand lens to a camera. 
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Yes, use the 67mm ring to attach accessories 
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hello , you could combine two(77-72,72-67) 
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Yes. Camera brand doesn't matter, it's all about the lens diameter.