These rings convert any classic Takahashi T-ring (M42x0.75 female input) into a wide field T-ring (M54x0.75 male input) for mounting on M54 threaded CA-35 photo adapters. Mounting is extremely simple. You just have to remove the core of the classic T-ring, held by 3 small side screws, and replace it by this conversion ring.
The conversion ring has an M48x0.75 internal thread for use with 50.8mm mounted filters. However, some ring mountings before the T-ring make their attachment impossible or even harmful; we invite you to refer to the system-charts of your instrument for possible mounting incompatibilities.
Warning! Two models are available because the diameter of the core of the Takahashi T rings is different according to the brand of the camera: 52 mm diameter for the Canon EF T-ring (#TKA00242), 49 mm diameter for those of other brands (#TKA00240).
A classic T-ring can be disassembled in two parts. In the case of a ring intended for Canon DSLRs with EF-mount, simply replace the center of the T-ring with the TKA00242 conversion ring to transform a classic Canon EF T-ring (#TKA00223), with M42x0.75 female thread, into a wide field Canon EF T-ring (#TKA00233), with M54x0.75 male thread.
| Characteristic | Takahashi Wide T conversion ring (Canon) |
| Item number | TATKA00242 |
| Mechanical input | M54x0.75, male |
| Mechanical output | 52mm diameter, male |
| Weight | - |
