M117x1mm to Optec-DSI 3.5x24tpi Adapter (19899)

Name: M117x1mm to Optec-DSI 3.5x24tpi Adapter (19899)
Brand: Optec
SKU: 19899
Price: 70.3 USD
Availability: InStock
Rating: 5.0 (5 reviews)

M117x1mm to Optec-DSI 3.5x24tpi Adapter (19899) - Main image

$70.3 ~~$95~~ In stock

Category: Astrophotography Accessories

The Optec M117x1mm to Optec-DSI 3.5x24tpi Adapter (19899) is a thread adapter designed to connect M117x1mm female threads to Optec-DSI 3.5x24tpi female threads. It is part of the Astrophotography Accessories category and is offered under the Optec brand.

M117x1mm female thread on one side
Optec-DSI 3.5x24tpi female thread on the other side
Adapter product code: 19899
Brand: Optec
Category: Astrophotography Accessories

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Customer Reviews (5.0 / 5 · 5 reviews)

Eva H. ★★★★★ Oct 21, 2026

I was a bit worried about getting the thread pitch right, but this adapter fits perfectly on my setup. The brass construction feels solid and should hold up well under heavy use.

Madison ★★★★★ Oct 20, 2026

Threads cut clean and square, so it screwed onto both my scope and the DSI without any wobble. The locking ring is a nice touch I didn't expect at this price point.

Mia L. ★★★★★ Oct 19, 2026

Finally found an adapter that lets me use my M117mm scope with the Optec-DSI setup, and the anodized finish feels solid. Threaded on smoothly with no wobble, which was my main concern.