Takahashi 17mm Spacer for TOA-150 (TKA26583)

Takahashi 17mm Spacer for TOA-150 (TKA26583)

The TOA-150 is one of Takahashi’s most acclaimed apochromatic refractors, known for its color correction, contrast, and uncompromising mechanical build. But when it comes to configuring accessories—especially visual backs or camera adapters—every millimeter of spacing matters. That’s where the TKA26583 comes in.

This 17mm spacer threads between the rear cell of the TOA-150 and the accessory of your choice, extending the optical path just enough to bring diagonal or imaging components into perfect focus. It’s a precision tool designed to eliminate the guesswork, the fiddling, and the “almost but not quite” scenarios that plague improvised setups. With Takahashi threading, finish, and tolerances throughout, the TKA26583 keeps your optical axis dead-on while giving you that critical bit of breathing room.

Whether you’re visual observing with a 2" diagonal or assembling a finely tuned imaging rig, this is the ring that makes the rest of the system snap into place.

Cloudy Nights Community Insight:
TOA-150 owners frequently recommend this part for anyone adding a mirror diagonal or building a rigid imaging train. One noted, “Without it, my diagonal bottoms out before I hit focus.” Others mentioned that it allowed the use of certain correctors and camera setups that wouldn’t quite reach focus otherwise.

Observing Tip:
If you’re switching between visual and imaging use, leave the spacer in place with your imaging train to avoid repeated disassembly. Its contribution to maintaining parfocal alignment across setups is subtle but significant.