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Optec OPTEC-4300 to DSI 3.5"(F) Adapter
The Optec OPTEC-4300 to DSI 3.5"(F) Adapter connects the Gemini rotator's OPTEC-4300 dovetail and accessories using the DSI 3.5-inch x 24 tpi female thread standard. Made of 6061-T6 aluminium, this adapter adds only 2.5 mm (0.1 in) of back-focus and has an overall height of 10.7 mm (0.42 in).
Gemini Rotator Integration: Add DSI 3.5" Spacers with 2.5mm Back-Focus
This adapter is the standard component for converting the camera-side of the Optec Gemini Focusing Rotator to a female DSI 3.5-inch thread. This allows you to attach Optec's DSI 3.5" spacers, so you can build up the back-focus your imaging train needs.
The adapter uses only 2.5 mm of back-focus.
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OPTEC-4300 Male Dovetail: Fits the camera-side receiver of the Optec Gemini Focusing Rotator.
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DSI 3.5" Female Thread: Provides a standard connection point for DSI 3.5-inch x 24 tpi threaded spacers and accessories.
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Minimal Back-Focus: Consumes only 2.5 mm (0.1 in) of your imaging train's available back-focus.
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Material: 6061-T6 aluminium.
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What is the primary use for the Optec OPTEC-4300 to DSI 3.5" Adapter?
This adapter is designed to connect accessories with a DSI 3.5-inch male thread, such as Optec's DSI 3.5" spacer set, to the camera side of the Optec Gemini Focusing Rotator. It converts the rotator's native OPTEC-4300 dovetail to a female DSI 3.5" x 24 tpi thread.
I have an Optec Gemini rotator and need to connect DSI 3.5" spacers. Is this the correct adapter?
Yes. This is the standard adapter for this purpose and is the same model included with a new Gemini rotator. It provides the necessary female DSI 3.5" x 24 tpi thread to attach your spacers securely.
How much back-focus does the OPTEC-4300 to DSI 3.5" Adapter consume?
The adapter adds exactly 2.5 mm (0.1 inches) to the optical path length. Its total physical height is 10.7 mm.
What are the thread specifications on the camera side of this adapter?
The camera side features a DSI 3.5-inch female thread with a pitch of 24 threads per inch (tpi).
What material is the Optec OPTEC-4300 to DSI 3.5" Adapter made from?
The adapter is made of 6061-T6 aluminium (Optec drawing).
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| Telescope Side Interface |
OPTEC-4300 dovetail (male) |
| Camera Side Interface |
DSI 3.5 in x 24 tpi female |
| Back-Focus Used |
2.5 mm (0.1 in) |
| Overall Height |
10.7 mm (0.42 in) |
| Material |
6061-T6 aluminium |
| Optical Length |
2.5 mm |
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OPTEC-4300 to DSI 3.5 in female adapter
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- Optec 1-Year Warranty
