Consists of three parts for eyepiece projection photography with Takahashi refractors only. The normal 1.25" Takahashi eyepiece holder is unscrewed from the telescope drawtube and replaced by a special compression ring 1.25" eyepiece holder from the TCA-4. A 1.25" eyepiece is inserted into the compression ring (0.965" eyepieces can be used by adding optional 0.965" adapter #TCA9AD) and locked in p . . .