Takahashi TSA-102 M72 to F72 Aux Extension Tube 52mm

Product Overview

The M72 to F72 Aux Extension Tube is Takahashi's Aux. Ring (FB TSA-102mm), threading M72 x 1.0 into the TSA-102's camera-side connection. It carries a published light path of 52 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 you own a TSA-102 and need 52 mm of additional M72 spacing to reach a target back focus for imaging or to fit a 2" visual accessory further out.

Key Features & Design

• M72 x 1.0 thread throughout: matches the TSA-102's own camera-side interface at both ends.
• 52 mm published light path: a fixed, known contribution to your back focus total.
• 2" clear aperture: passes a full 2" light cone without vignetting concerns from the tube itself.

Recommended Uses

Adding 52 mm of M72 spacing to a TSA-102 imaging train, or extending the reach of a 2" visual accessory chain.

Compatibility and Accessory Notes

Built for the TSA-102, with M72 x 1.0 threading on both ends. At 52 mm, it is a substantial part of most back-focus budgets, so it is worth checking against your camera, flattener, and any other spacers 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

52 mm is a large fixed step: because it cannot be trimmed, it is worth confirming it lands your train at the right total before ordering rather than after. Send us your full imaging or visual setup and we will work out the spacing with you.

Frequently Asked Questions

Is it difficult to set up?

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

What is it used for?

Adding a fixed 52 mm of M72 spacing in a TSA-102 imaging or visual accessory train.

Does it work for both visual and imaging use?

Yes — it is a mechanical extension tube with a full 2" clear aperture, so it carries through either a visual or imaging chain.

Bottom Line

A 52 mm light-path, M72 extension tube for the TSA-102. It is worth confirming against the rest of your train before ordering, given the size of the step.