Takahashi RD Aux Ring Extender for Mewlon-300

Product Overview

The RD Aux Ring Extender is a 38 mm M72 extension sleeve built for the Mewlon-300CR and Mewlon-300CRS. It sits in the imaging train alongside reducer and extender accessories, and threads to any other Takahashi telescope carrying the same M72 interface.

Who It's For

This is what you need if you own a Mewlon-300CR or Mewlon-300CRS and your reducer or extender train needs an additional 38 mm of M72-threaded spacing.

Key Features & Design

• M72 thread: Takahashi's standard interface for the Mewlon-300 imaging train.
• 38 mm length: the extension it adds to your reducer or extender stack.
• Cross-compatible: fits any Takahashi telescope using the same M72 thread, not only the Mewlon-300.

Recommended Uses

• Building out a reducer or extender train on the Mewlon-300CR or 300CRS where an extra 38 mm of M72 spacing is needed.

Compatibility and Accessory Notes

If you're planning a full imaging train and want the spacing confirmed before you order, send us your reducer or extender and we'll work it out with you. See the Takahashi Back Focus Guide for published telescope back focus figures.

Frequently Asked Questions

Is it difficult to set up?

No — it threads directly into the M72 imaging train with no adjustment required.

Will it fit telescopes other than the Mewlon-300?

Yes, any Takahashi telescope using the same M72 thread standard.

Do I need this for a standard Mewlon-300 setup?

Only if your reducer or extender combination needs the extra 38 mm of spacing. Send us your imaging train and we will confirm whether it applies.

Bottom Line

In short: a 38 mm, M72-threaded extension ring for the Mewlon-300CR and 300CRS reducer/extender train.