Allows you to use 1.25" filters with T-threaded accessories. Has a 1.25" female filter thread (M28.5x0.6) on one side and male T / T2 thread (M42x0.75) threads on both sides. The 1.25" filter can be attached from either side - it will sit completely within this adapter if connected from one side, or the filter cell will stick out beyond this adapter if connected from the other side.
Total thickness = 11.8mm / 0.46". Length of each male T-thread section = 5.2mm / 0.20". Length of female 1.25" filter thread = approximately 3.8mm / 0.15".
Baader part number: T2-31 or 1508030