The Nikon wide T-adapter has a M48 thread that is ideal for full frame cameras

The standard T2 ring uses a M42 thread that is suitable only for Nikon cameras with APS sensor. Full frame sensors have a diagonal of 43.3mm which which is wider than the 42mm thread of standard T2 ring. Using a T2 ring on full frame cameras will cause vignetting.

This adapter suits all Nikon F-mount cameras (not their mirrorless Z range).

Specifications