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Optec DSI 3.5"x24tpi(M) to M72x1(M) Takahashi Adapter
The Optec DSI 3.5"x24tpi(M) to M72x1(M) Takahashi Adapter converts the DSI 3.5-inch by 24 tpi male thread to the M72 x 1mm male standard used on Takahashi equipment. It has a 65.0mm clear aperture, uses 3.8mm of back-focus, and is made of 6061-T6 aluminum with a 97.0mm outer diameter.
From DSI 3.5"x24tpi to Takahashi M72x1 Thread
This adapter links devices using the Optec DSI 3.5-inch female thread and telescope focusers or accessories that require an M72x1 female connection. With male threads on both sides (DSI 3.5-inch x 24 tpi and M72 x 1mm), it works as a thread converter.
A 65.0mm Clear Aperture with 3.8mm Back-Focus Usage
The adapter has a 65.0mm (2.56 in) clear aperture and uses 3.8mm (0.15 in) of back-focus, both from Optec's drawing.
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Material: 6061-T6 aluminum.
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Clear aperture: 65.0mm (2.56 in).
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What is the primary function of the Optec DSI to M72 adapter?
The primary function of this Optec adapter is to convert the DSI 3.5-inch x 24 tpi male thread common on Optec equipment to the M72 x 1mm male thread used on Takahashi equipment. This allows you to connect components from these two different systems securely.
How much back-focus does the Optec DSI to M72 adapter consume?
This adapter consumes only 3.8mm (0.15 inches) of back-focus. Its thin profile is designed to preserve as much of your imaging train's available spacing as possible for other accessories like filter wheels or off-axis guiders.
I have an Optec DSI 3.5" focuser and a Takahashi OTA with an M72 female thread. Is this the right Optec adapter?
Yes, if your focuser has a female DSI 3.5 in x 24 tpi thread. The adapter threads into the female DSI 3.5" port on your focuser and present the male M72x1 thread needed to connect to the Takahashi's female M72 port.
What is the outer diameter of the Optec DSI to M72 adapter?
The outer diameter of the adapter is 97.0mm (3.82 inches).
What material is the Optec #19917 adapter made from?
The adapter is made of 6061-T6 aluminum (Optec drawing).
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| Device-Side Thread |
DSI 3.5 in x 24 tpi male |
| Telescope-Side Thread |
M72 x 1 mm male (Takahashi) |
| Back-Focus Used |
3.8 mm (0.15 in) |
| Clear Aperture |
65.0 mm (2.56 in) |
| Outer Diameter |
97.0 mm (3.82 in) |
| Material |
6061-T6 aluminium |
| Optical Length |
3.8 mm |
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DSI 3.5"x24tpi(M) to M72x1(M) Takahashi Adapter
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Optec 1-Year Warranty
