Takahashi FC100 Camera Ring M72-M55.9 Coupling

Product Overview

The FC100 Camera Ring M72 - M55.9 Coupling is the piece that lets an M72-threaded accessory — a reducer, flattener, or camera ring — mate with an M55.9-threaded drawtube or accessory further down the train. Takahashi uses both standards across the FC-100 series, and this ring is what joins them.

Who It's For

This is a good match if your imaging or visual train mixes M72 and M55.9-threaded Takahashi accessories and you need the coupling that bridges the two.

Key Features & Design

• M72 x 1.0 thread on one side: Takahashi's wider accessory standard, used on reducers, flatteners and camera rings.
• M55.9 x 0.75 thread on the other: Takahashi's drawtube-accessory standard on several refractors, including the FC-100 series.
• Takahashi part TKA19205 — Takahashi's own "M72/M55.9 coupling" designation.

Recommended Uses

Use it to join an M72-threaded accessory — a reducer, flattener, or camera ring — to an M55.9-threaded drawtube or accessory further down the FC-100 train.

Compatibility and Accessory Notes

It bridges Takahashi's M72 x 1.0 and M55.9 x 0.75 accessory standards, both used on the FC-100 series. The Takahashi Back Focus Guide is still worth checking for the back focus target on your FC-100 once the rest of your train is planned.

Frequently Asked Questions

Is it difficult to set up?

No — it threads between the two accessory standards it was built to join, with nothing to align.

What is it best used for?

Joining M72 and M55.9-threaded accessories in an FC-100 imaging or visual train.

Is this coupling specific to the FC-100, or does it fit other Takahashi scopes?

Takahashi documents both threads it bridges on the FC-100 series specifically; other Takahashi refractors sharing either standard can use it the same way. Send us your telescope model and we'll confirm the fit.

Bottom Line

A coupling that bridges Takahashi's M72 and M55.9 accessory standards, purpose-built for mixed-thread FC-100 trains.