Optec-DSI 3.5x24tpi to M92x1mm Adapter (19916)

Name: Optec-DSI 3.5x24tpi to M92x1mm Adapter (19916)
Brand: Optec
SKU: 19916
Price: 60.8 USD
Availability: InStock
Rating: 4.8 (5 reviews)

Optec-DSI 3.5x24tpi to M92x1mm Adapter (19916) - Main image

$60.8 ~~$95~~ In stock

Category: Astrophotography Accessories

Description

Optec-DSI 3.5x24 male thread to M92x1mm male Takahashi thread. COMBINE WITH #19807 AND #17748 PYXIS 3" TO REPLACE CAA [TPF1106].

Specifications

Outside Diameter: 3.95" (100.3mm)
Overall Height: 0.70" (17.8mm)
Clear Aperture: 3.25" (82.6mm)
Back-focus Usage: 0.15" (3.8mm)

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (4.8 / 5 · 5 reviews)

Brian G. ★★★★★ Oct 21, 2026

The machining on this adapter is spot-on—the 3.5x24tpi threads mate with my setup without any wobble, and the 3.95" outside diameter clears everything it needs to. I swapped out the CAA using the recommended combos and it fit like it was made for the job.

Olivia R. ★★★★★ Oct 20, 2026

The threads engaged perfectly with my Takahashi setup, and the 3.95" outside diameter matched the specs for a snug fit. No more adapter wobble when swapping gear.

James G. ★★★★★ Oct 19, 2026

Finally got my PYXIS 3" rig dialed in thanks to this adapter – the M92x1mm thread engaged perfectly with my Takahashi focuser, zero wobble. Outer diameter is a solid 3.95", so it's a snug, precise fit for the whole assembly.