Skip to content
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.

Optec DSI Direct Screw Interface Adapters

Optec DSI Direct Screw Interface adapters use a large 3.5" threaded connection to join Optec focusers and rotators to telescopes and cameras without set screws or compression rings. The line includes a 3.5"x24tpi to M72x1 adapter for Takahashi telescopes, an OPTEC-4300 to DSI 3.5" adapter and a five-piece 3.5" extension tube set.

A fully threaded train keeps heavy cameras rigid and square to the optical axis, which helps against tilt and flexure in long exposures.

Filters

$135.00 - $135.00
$135.00
$135.00 - $135.00
$135.00

Optec OPTEC-4300 to DSI 3.5"(F) Adapter

OPC-19830

The #19830 OPTEC-4300 to female Optec/DSI 3.5" threaded receiver allows any combination of our DSI 3.5-inch spacers to be easily installed on the c...

View full details
$135.00 - $135.00
$135.00
$135.00 - $135.00
$135.00
$95.00 - $95.00
$95.00
$95.00 - $95.00
$95.00

Optec DSI 3.5"x24tpi(M) to M72x1(M) Takahashi Adapter

OPC-19917

Optec-DSI 3.5x24tpi male thread to M72x1mm (male) Takahashi thread. Outside Diameter: 3.82" (97.0mm) Overall Height: 0.74" (18.8mm) Clear Aperture...

View full details
$95.00 - $95.00
$95.00
$95.00 - $95.00
$95.00
$250.00 - $250.00
$250.00
$250.00 - $250.00
$250.00

Optec DSI 3.5" Extension Tube Set - 5 Pieces

OPC-19890

Rich Simons of Deep Sky Instruments and Optec have jointly developed a new, larger diameter standard spacer for large aperture telescopes. Like th...

View full details
$250.00 - $250.00
$250.00
$250.00 - $250.00
$250.00