More room to position.
Two ways to mount.
A longer mounting platform for your telescope or imaging setup, with Vixen and Arca-Swiss interfaces in one red anodised aluminium plate.

Space where it matters.
The SV239 brings two familiar mounting standards together. Its slotted layout gives you scope to choose attachment positions, while ¼″-20 and ⅜″-16 threaded holes provide further connection options.
Choose the length around your equipment’s attachment points and available clearance. A longer plate can be useful when planning the position of tube rings or other mounting hardware.
Check the complete connection
Match the saddle profile, attachment spacing and screw threads before ordering. Vixen and Arca-Swiss describe mounting interfaces; they do not guarantee that every clamp, ring or telescope will fit without additional hardware.
Check screw engagement and clearance carefully. A bolt that is too long can bottom out before the equipment is securely attached. Tube rings, saddle and telescope are separate items.
Specifications
| Brand / model | SVBONY SV239 |
|---|---|
| SKU | F9143B |
| Length | 254mm |
| Upper / lower width | 38mm / 43.5mm |
| Height | 15.5mm |
| Material / finish | Aluminium alloy / red anodised |
| Mounting interfaces | Vixen and Arca-Swiss |
| Threaded holes | UNC ¼″-20 and UNC ⅜″-16 |
| Through-hole diameter | 6.5mm |
| Slot size | 87 × 6.5mm |
| Top / bottom groove depth | 6mm |
| Net weight | 172g |
Included in the box
- SV239 254mm dovetail plate
- L-shaped hex key
- Two M6 × 16mm socket screws
Before fitting
Support the telescope while attaching or adjusting the plate. Confirm that the saddle grips securely, then check balance with the complete observing or imaging equipment installed.
Use fasteners suitable for your equipment; the supplied screws may not suit every installation.
Choosing your plate
Is this the same as the 185mm SV239?
This is the longer 254mm version. If your setup needs a shorter plate, see our SV239 185mm dovetail plate. Choose by mounting geometry and clearance, rather than length alone.
Will this fit a Losmandy-style saddle?
The stated interfaces are Vixen and Arca-Swiss. Do not assume direct compatibility with a Losmandy-only saddle; check the saddle specifications or ask us before ordering.
Can you help me check compatibility?
Send Dark Clear Skies the model of your mount or tripod head, the equipment you want to attach, and a photograph of its mounting points. That gives us the information needed to help check the connection.