Oversized t-ring for Nikon DSLR cameras. Use it with photographic field flatteners that have the oversized 48 mm attachment thread.
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This ring works great with the SV 3 inch field flattener on my SV102. There is a little vignetting in the extreme corners of the 36 x 24 mm camera sensor with this combo but it is relatively minor and is usually eliminated when I crop my photos.