Takahashi CCA-250 Visual Adapter 17mm

Product Overview

The CCA-250 Visual Adapter is a Takahashi coupling with a published light path of 17 mm — the amount it contributes to your optical train, not its physical length end to end. Takahashi lists it as compatible with the CCA-250, FSQ-85EDX, FSQ-106ED, FC-100DL, and FC-100DF.

Who It's For

This is a good match if you own one of its listed telescopes and need a compact visual coupling to complete an eyepiece or accessory connection.

Key Features & Design

• 17 mm published light path: a small, precise addition to a visual or imaging train.
• Multi-scope compatibility: a single part number covers the CCA-250, FSQ-85EDX, FSQ-106ED, FC-100DL, and FC-100DF.
• Solid metal coupling: pairs with Takahashi's Coupling S and Coupling L rings for extended reach.

Recommended Uses

Completing a visual eyepiece connection or an intermediate coupling step in an imaging train on any of its compatible telescopes.

Compatibility and Accessory Notes

Compatible with the CCA-250, FSQ-85EDX, FSQ-106ED, FC-100DL, and FC-100DF. The 17 mm figure is worth adding into your full back-focus total alongside any flattener, reducer, or filter wheel already in the chain — the Takahashi Back Focus Guide tabulates every Takahashi adapter's light path alongside each telescope's back focus target.

Frequently Asked Questions

Is it difficult to set up?

No — it is a single coupling with no adjustment, though confirming the thread match on both sides is worth doing before you order the rest of your train.

What is it used for?

Adding a defined 17 mm connection point in a visual or imaging chain on the CCA-250, FSQ-85EDX, FSQ-106ED, FC-100DL, or FC-100DF.

Can it be combined with Takahashi's Coupling S and Coupling L?

Yes — Takahashi pairs this adapter with the Coupling S and Coupling L rings when more reach is needed.

Bottom Line

A 17 mm visual coupling for the CCA-250 and its compatible FSQ and FC-100 telescopes.