Takahashi 1.25" Compression Ring Eyepiece Adapter 29mm

Product Overview

The 1.25" Compression Ring Adapter is Takahashi's Eyepiece Adapter (31.7), threading M36.5 x 1.0 male into the optical train and opening a 1.25" compression-ring seat for eyepieces and other 1.25" accessories. It carries a published light path of 29 mm — the amount it contributes to your optical train, not its physical length end to end.

Who It's For

This is a good match if your Takahashi telescope ends in an M36.5 thread and you want a secure, compression-ring 1.25" seat rather than a set-screw fitting.

Key Features & Design

• 1.25" compression ring: clamps evenly around the eyepiece or accessory barrel rather than pinching it at one point.
• M36.5 x 1.0 male thread: the tube-side connection published in Takahashi's catalog.
• 29 mm published light path: a fixed, known contribution to your back focus total.

Recommended Uses

Accepting 1.25" eyepieces, Barlows, filters, or small imaging accessories on any Takahashi telescope ending in an M36.5 thread.

Compatibility and Accessory Notes

Threads onto any M36.5 x 1.0 male-compatible Takahashi drawtube or coupling. For an imaging train, the 29 mm figure is worth adding to your total back focus — 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

It is a visual-format fitting: the 1.25" barrel it opens is sized for eyepieces and small 1.25" accessories rather than a full-frame imaging sensor. Send us your setup if you are unsure whether your camera fits within a 1.25" barrel.

Frequently Asked Questions

Is it difficult to set up?

No — it threads on at the tube side and the compression ring tightens with a single screw around whatever 1.25" accessory is inserted.

What is it used for?

Opening a secure 1.25" seat for eyepieces, Barlows, filters, or small cameras on an M36.5-thread Takahashi telescope.

How is a compression ring different from a set-screw adapter?

A compression ring clamps evenly around the full circumference of the barrel rather than pressing at a single point, which is gentler on the barrel finish.

Bottom Line

A 29 mm light-path, M36.5 male adapter that opens a 1.25" compression-ring seat for eyepieces and small accessories.