Takahashi FS-60CB Auxiliary Ring 57mm

Product Overview

The Auxiliary Ring (FS-60CB) is a Takahashi adapter ring built for the FS-60CB refractor's camera-side thread. It carries a published light path of 57 mm — the amount it adds to your optical train, not its physical length end to end — with an M52 x 0.75 male thread on one side and an M55.9 x 0.75 female thread on the other.

Who It's For

This is a good match if you own an FS-60CB and need to extend or adapt its camera-side connection to reach a specific back focus or fit an additional accessory in the train.

Key Features & Design

• 57 mm published light path: a fixed, known contribution to your back focus total.
• M52 x 0.75 male to M55.9 x 0.75 female threads: matches the FS-60CB's own camera-side interface on one end.
• Single-piece aluminum ring: no moving parts to maintain.

Recommended Uses

Extending the FS-60CB's camera-side train for imaging, or adapting it to accept a further eyepiece or coupling for visual use.

Compatibility and Accessory Notes

Built for the FS-60CB. Because 57 mm is a meaningful fraction of most imaging back-focus budgets, it is worth checking this figure against your camera and any flattener or reducer already in the train — the Takahashi Back Focus Guide tabulates every Takahashi adapter's light path alongside each telescope's back focus target.

Good to Know Before You Order

Light path adds up quickly on a short-focus scope: on the FS-60CB, 57 mm is a large share of the available back focus budget. Send us your full camera and accessory chain and we will work out the total spacing with you.

Frequently Asked Questions

Is it difficult to set up?

No — it threads on at both ends with no adjustment involved.

What is it used for?

Adding a defined 57 mm of light path to the FS-60CB's camera-side train, most often to reach a target back focus for a flattener or camera.

Does it change what the FS-60CB can be used for?

No — it is a mechanical spacer with no optical elements, so it works the same for visual or imaging use.

Bottom Line

A 57 mm light-path ring for the FS-60CB, with M52 male and M55.9 female threads on either end. It is worth confirming against the rest of your train before ordering.