Cloud Break Optics

Optec-DSI 3.5x24tpi to T-thread Adapter (19912)

Optec-DSI 3.5x24tpi to T-thread Adapter (19912) - Main image
$57 $95 In stock

Category: Astrophotography Accessories

The Optec-DSI 3.5x24tpi to T-thread Adapter (19912) is an astrophotography accessory that connects a 3.5x24tpi male thread to a male T-thread. It is offered under the Optec brand as a Standard SKU.

  • Brand: Optec
  • SKU: 19912
  • Category: Astrophotography Accessories
  • Connector type: 3.5x24tpi male thread to male T-thread
Before you pay

Check the method and total at checkout.

When it ships

Allow for processing time as well as the journey to you.

Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

View policy
If you need a refund

Keep your order number and contact the store to start.

Please contact us for the refund processing timeframe before returning an item.

View policy
Delivery costs

Review the cost for your destination and chosen service.

Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

View policy
Returning an item

Check the return conditions before sending anything back.

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

View policy

Customer Reviews (4.4 / 5 · 5 reviews)

Leo ★★★★★

Threads are cut clean and square, so the adapter screws onto my focuser without any wobble or play. It's exactly the right depth to reach proper back focus for my camera. No complaints here, this little piece does its job perfectly.

Amelia ★★★★★

The threads on this adapter are machined perfectly—no wobble when attaching my filter wheel. Screwed on smoothly to my scope without any binding. Exactly what I needed to get my imaging train aligned.

Zoe N. ★★★★★

Finally, a way to mount my guide scope without fighting thread adapters – this adapter threads on smoothly and the T-thread connection feels rock solid.