Takahashi 98mm to Wide Mount Adapter

Product Overview

Takahashi calls this the Coupling (TW) for the CCA-250, part TKP86003 — the piece that connects the 98 mm accessory family to Takahashi's Wide-Mount T-ring camera system. Takahashi publishes a light path length of 34.2 mm for it — what it adds to the train, not its physical size — and that's enough spacing to plan around if you're already close to a flattener's backfocus target.

Who It's For

This is a good match if you're running a CCA-250-based 98 mm accessory train and want to move to Takahashi's Wide-Mount T-ring system for your camera connection.

Key Features & Design

• 98 mm-thread telescope side: part of the CCA-250 accessory family.
• Wide-Mount camera side: steps down to Takahashi's Wide-Mount ring and T-ring system.
• 34.2 mm light path length: Takahashi's published figure for this coupling's contribution to the optical train.

Recommended Uses

• Connecting a Wide-Mount camera train to a 98 mm CCA-250-based accessory chain.
• Switching a CCA-250 setup from its native camera coupling to the Wide-Mount T-ring system.

Compatibility and Accessory Notes

• Part of Takahashi's CCA-250 / 98 mm accessory family on the telescope side, and the Wide-Mount T-ring system on the camera side.
• Adds 34.2 mm to the optical path. Our Takahashi Back Focus Guide lists it alongside the back focus figures for each telescope.
• Purely mechanical — no optical element, no change to focal length or focal ratio.

Good to Know Before You Order

• Takahashi doesn't spell out the exact thread callout on each face, beyond its role connecting the 98 mm and Wide-Mount systems. Send us your full accessory stack and we'll confirm the fit before you order.
• It adds 34.2 mm to the optical path, worth checking against your focuser's inward travel.

Frequently Asked Questions

Is it difficult to set up?

No — it threads between the two accessory families like any other coupling, with nothing to align.

What does it add to my optical train?

34.2 mm, per Takahashi's published figure.

What does it connect?

The 98 mm CCA-250 accessory family on one side and Takahashi's Wide-Mount T-ring camera system on the other.

Does it include any optics?

No. It's a mechanical adapter only.

Bottom Line

In short: Takahashi's 98 mm-to-Wide-Mount coupling — 34.2 mm of light path, connecting a CCA-250 accessory train to the Wide-Mount T-ring camera system.