Seletek family—autonomous focus controller
The most advanced autonomous focus controller.
Leave the computer at home.
This product belongs to the Lunaticoastro focuser and rotator controllers family, which has reached End of Life status. Remaining units are sold while stocks last. Future software updates and compatibility updates are not planned.
The Tarsier was built for astrophotographers who want full motor control without a laptop. Its own display, physical controls, focus memory, and temperature tracking give you everything you need: at the telescope, on the field, with no software to set up.
The Tarsier inherits all the motor expertise built into the Seletek line—compatible with every Seletek motor, coupling and focusing accessory—and extends it to almost any third-party motor on the market.
At the same time it operates as a fully standalone unit: no laptop, no ASCOM, no WiFi required. The LCD shows position and temperature in real time. The controls let you move the motor at any increment or speed. And when you find focus, you save it and come back to it any time.
The red-backlit display is dim enough for dark-adapted eyes and fully adjustable in brightness.
Remember focus points and «goto» any of them directly. Switch from one target to another without refocusing from scratch, useful for star parties or multi-target nights.
The Tarsier monitors ambient temperature continuously and can apply automatic focus corrections on the fly, by itself, without any command from a computer.
Move the motor at small precise increments for fine focus, or continuously at slow or fast speed for coarse adjustment. All from the physical controls.
Motor model, backlash compensation, output power, speed curves, LCD backlight intensity: every parameter is accessible through the on-device menu.
Moving the focus motor from the controller instead of by hand avoids introducing vibration at the scope when adjusting focus, which matters for long-exposure imaging.
The 8×2 character display uses red backlight to preserve your dark-adapted vision. Brightness is adjustable so it's never more intrusive than it needs to be.
The Tarsier has two separate motor connectors—one for stepper motors, one for DC motors—covering the great majority of focuser motors already in use in the field.
High-accuracy stepper motor control with full position tracking. DB9 plug for stepper motors, such as our own time-proven 3600 steps/turn motor, or others from Robofocus, Moonlite, Lakeside, FeatherTouch and more. Compatible with the complete Seletek motor range and the main third-party stepper focuser brands.
DC motor support brings the Tarsier to the many focusers that use simple bi-directional DC drives, without any adapter or modification.
| Display | 8×2 character LCD, red backlight (adjustable) |
| Stepper motor connector | DB9 (9-pin D-sub) |
| DC motor connector | Mono audio jack |
| Power supply | 12V DC, standard jack (positive centre) |
| Dimensions | 144 × 95 mm |
| Compatible motors | Seletek, Robofocus, Moonlite, Lakeside, FeatherTouch (stepper); Orion, Rigel Systems (DC) |
| Focuser accessories | All Seletek family motors, couplings and plates |
| Operation | Fully standalone—no PC or smartphone required |
| Configurable parameters | Motor model, backlash, power, speed, backlight intensity |
Every manual, driver and guide for the Tarsier, on one page—together with the rest of the range.
Complete guide covering hardware setup, motor configuration, focus memory and all on-device settings.
Download PDF →Mounting guide for focusers that use the Lunatico custom coupling plate—Baader, GSO, Takahashi, William Optics, and other compatible models.
Read guide →Software and firmware downloads for the Armadillo, Platypus, Limpet and original Seletek controllers. The Tarsier is standalone and needs no PC software.
Go to downloads →