Takahashi 1.25" Adapter for 2" Diameter Focusers (TKA00111)
Manufacturer Part # TKA00111
Takahashi 1.25" Adapter for 2" Diameter Focusers (TKA00111)
If you’re working with a Takahashi focuser or diagonal that accepts 2" accessories but prefer the portability and convenience of 1.25" eyepieces, this adapter is a must-have. The TKA00111 is a precision-machined, low-profile step-down adapter designed specifically for Takahashi’s optical systems. It allows you to use any standard 1.25" eyepiece or accessory in a 2" Takahashi focuser, visual back, or diagonal without sacrificing alignment or introducing flexure.
The adapter’s non-marring brass compression ring secures your eyepiece or diagonal firmly in place without scoring the barrel. Threads and tolerances are sharp and clean, reflecting Takahashi’s reputation for mechanical precision. The low profile helps maintain your available back focus—an important consideration when using imaging trains, binoviewers, or setups that push focus limits.
Whether you're fine-tuning your planetary setup with compact high-power eyepieces or just want a secure, well-aligned 1.25" connection, the TKA00111 delivers the kind of precision Takahashi users have come to expect.
Cloudy Nights Community Insight:
While the TKA00111 doesn’t often appear by name in user threads, there’s a consistent pattern among Takahashi owners who favor 1.25" eyepieces for their lighter weight, tighter field stops, and compatibility with smaller diagonals. One experienced user remarked that switching to a 1.25" diagonal and eyepieces “saved weight and made the whole setup feel more responsive,” especially on smaller alt-az mounts. Others noted the improved balance and reduced sag when using lighter eyepiece configurations with this kind of adapter.
Observing Tip:
For critical high-power work—especially lunar or planetary—consider using this adapter with a 1.25" prism diagonal. The combination often delivers sharper images than a mirror-style diagonal, and the low-profile design helps preserve precious back focus on systems like the FS-60Q or FC-100DZ.