Takahashi TOA-130 25mm Spacer Ring for 67 Flattener

Product Overview

This 25 mm ring — Takahashi's "Ring #82" — is the TOA-130NFB-specific output adapter for the 67FL Flattener system. The 67FL Flattener corrects a 90 mm image circle at an optimal 106.2 mm back focus, and this ring is what sets that spacing correctly on the TOA-130NFB.

Who It's For

This is what you need if you own a TOA-130NFB and are fitting the 67FL Flattener for large-format imaging. It is a spacing part, not a standalone corrector.

Key Features & Design

• 25 mm output length: the figure published for the TOA-130NFB fitting.
• M92 x 1.0 interface: matches the 67FL Flattener's own thread family.
• Telescope-specific: the TOA-150 uses a different ring in the same system, at 17 mm output.

Recommended Uses

• Large-format imaging on the TOA-130NFB with the 67FL Flattener, covering the system's 90 mm corrected circle.

Compatibility and Accessory Notes

The 67FL Flattener kit uses different output rings depending on the host telescope: 25 mm for the TOA-130NFB (this ring, TKA31584) and 17 mm for the TOA-150 (TKA26583). Confirm which telescope you're fitting before ordering — the rings are not interchangeable between the two. Full spacing figures are in the Takahashi Back Focus Guide.

Good to Know Before You Order

• It does not work alone. This ring only sets spacing for the 67FL Flattener on the TOA-130NFB — the flattener itself is a separate purchase.

Frequently Asked Questions

Is it difficult to set up?

No — it threads onto the 67FL Flattener at the published M92 x 1.0 interface and sets the 25 mm spacing without adjustment.

Will this fit my TOA-150?

No — the TOA-150 uses its own 17 mm ring (TKA26583) in the same 67FL Flattener system. This 25 mm ring is specific to the TOA-130NFB.

Do I need the 67FL Flattener as well?

Yes — this ring only sets the spacing; the flattener carries the optics.

Bottom Line

In short: the 25 mm output ring that fits the 67FL Flattener to the TOA-130NFB at the M92 x 1.0 interface, setting up the system's 90 mm corrected image circle.