FOCUS 35 Robotic Total Station

The Spectra Precision FOCUS 35 is a new range of motorised total stations providing high speed, accuracy and precision in measurement. The FOCUS 35 robotic instrument moves the power of the observer from the instrument to the range pole, improving efficiency. The speed of observation and precise positioning of the FOCUS 35 Robotic Total Station is provided by patented StepDrive™ motion technology, which controls the horizontal and vertical motion of the motors, eliminating the need for traditional motion locks. The FOCUS 35 includes a tracking sensor that uses LockNGo™ FastTrack tracking technology, enabling the instrument to constantly lock onto the prism.The FOCUS 35 RX extended operation models feature market-leading battery life.

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The FOCUS 35 is available in 1”, 2”, 3” or 5” accuracies and is controlled by the Spectra Precision Survey Pro™ field software using an onboard Windows CE touchscreen interface. The FOCUS 35 is also designed to be controlled externally by Spectra Precision Ranger™, Nomad™, or T41® data collectors running Spectra Precision Survey Pro field software,  Spectra Precision Layout Pro or Spectra Precision FAST Survey on the Ranger or Nomad.

All robotic instruments include:
     • a motorised drive system at the instrument
     • a tracking sensor to track the range pole and prism
     • a communication connection between the instrument and range pole and prism

The speed of observation and precise positioning of the FOCUS 35 robotic total station is provided by patented StepDrive ™ technology. StepDrive controls the horizontal and vertical motion of the motors, so there is no need for traditional motion locks. Using the motorised drives it is possible to precisely turn to, and repeat angle measurements. This results in quick and reliable measurements which substantially increases your staking productivity.

The Robotic, RX and LockNGo™ FOCUS 35 models include a tracking sensor that uses LockNGo technology enabling the instrument to constantly lock onto the prism. The benefit of LockNGo technology is the ability to follow the prism at all times and reduces downtime from not having to re-point the instrument on every observation.

To maintain contact between the FOCUS 35 instrument and the remote observer with the range pole and prism, the robotic solution must include a communication link. The FOCUS 35 uses an integrated 2.4 GHz radio modem as does the Spectra Precision Ranger™ 3 data collector. The 2.4 GHz radio modems provide interference free robotic data communications.

Once your robotic communications have been established you can control all the functions of the FOCUS 35 from the range pole as you move through the job site making measurements. This makes it possible for a single surveyor to perform high accuracy stakeout, layout or topographic surveys by themselves. From high-order control surveys to topographic data collection or fast-paced construction layout, you can rely on a FOCUS 35, even in harsh outdoor conditions.

The FOCUS 35 total station is combined with Spectra Precision Survey Pro field software, providing you with world class software solutions for any surveying application. An example of these features includes a unique robotic software technology that can be used when associating the FOCUS 35 with a low-cost GPS receiver and Survey Pro software. This combination of technologies allows the user to take full advantage of the Spectra Precision GeoLock ™ technology to keep locked on target.

The Spectra Precision GeoLock technique allows a robotic total station to perform an aided search for an optical target using an initial GPS position. The remote instrument can then be directed towards the robotic roving operator using the GPS position and a subsequent search is quickly performed to re-acquire the target at the robotic rover. This technique greatly reduces wasted time, improving your field work efficiency.

The FOCUS 35 robotic solution is best described as Simply More Powerful. Packaged in a modern, sleek, and streamlined design, it is easy-to-use, affordable and tough. FOCUS 35 Total Stations are designed to meet all your surveying needs.

The FOCUS SPDL 2.4 Radio Bridge is a rugged lightweight custom accessory designed to allow communication between Spectra Precision robotic total stations and bluetooth-enabled mobile devices.

Features & Benefits

     • StepDrive™ motion technology
     • LockNGo™ tracking technology
     • Spectra Precision Survey Pro™ software on-board
     • Available in 1″, 2″, 3″ and 5″ angle accuracies
     • Long-range, reflectorless distance measurement
     • Available RX models with extended operation dual battery system.
     • High-precision prism measurements
     • GeoLock™ GPS-assist technology


Angle measurement
Accuracy (Standard deviation based on ISO 17123-3)
     • 1″ (0.3 mgon)
     • 2″ (0.6 mgon)
     • 3″ (1.0 mgon)
     • or 5″ (1.5 mgon)
Angle reading (least count display)
1″ Model
1″ (0.3 mgon)
0.5″ (0.15 mgon)
2″ (0.6 mgon)
Distance measurement
Accuracy to Prism (Standard deviation based on ISO 17123-4)
2 mm + 2 ppm (0.007 ft + 2 ppm)
5 mm + 2 ppm (0.016 ft + 2 ppm)
Accuracy Reflectorless Mode
Standard 300 m (984 ft)
5 mm + 2 ppm (0.016 ft + 2 ppm)
10 mm + 2 ppm (0.033 ft + 2 ppm)
Measuring time
Prism Standard
Prism Tracking
Reflectorless Standard
Reflectorless Tracking
2.4 sec
0.5 sec
3–15 sec
0.7 sec
Range Prism Mode
1 prism
3 prisms
Foil Reflector 60 mm
4000 m (13,123 ft)
7000 m (22,966 ft)
300 m (984 ft)
Range Reflectorless Mode
Good Normal Difficult
KGC (18%) 400 m
(1,312 ft)
350 m
300 m
(984 ft)
KGC (90%) 800 m
(2,625 ft)
600 m
(1,969 ft)
400 m
(1,312 ft)
Foil Reflector 60 mm 1,000 m
(3,280 ft)
1,000 m
(3,280 ft)
800 m
(2,625 ft)
Shortest Possible Range 1.5 m (4.9 ft)
Automatic Level Compensator
Working Range
0.5″ (0.15 mgon)
±5.5′ (±100 mgon)
EDM Specifications
EDM Laser and Principle
Light source Laser Diode 660 nm
Principle  Phase Shift
EDM Beam Divergence
Atmospheric Correction 
4 cm/100 m (0.13 ft/328 ft)
3 cm/100 m (0.10 ft/328 ft)
–150 ppm to 160 ppm continuously
General Specifications
Coarse Levelling
Electronic Coarse Levelling Range ±3° (±3.3 gon)
Circular Level in Tribrach 8’/2 mm (8’/0.007 ft)
Drive system
Rotation time maximum
Rotation time Face 1 to Face 2
Positioning time 180º (200 gon)
Clamps and slow motions
Spectra Precision® StepDrive™ system
90º/sec (100 gon/sec)
3.7 sec
3.5 sec
StepDrive driven, endless fine adjustment
Centering System
     – Magnification
     – Focusing Distance
Built-in optical plummet
2.4 x
0.5 m to ∞ (1.6 ft to ∞)
Field of View
Focusing Distance
Illuminated Crosshair
Tracklight Built-in
Trunnion Axis Height
50 mm (1.96 in)
1.5 m to ∞ (4.9 ft to ∞)
196 mm (7.71 in)
Operating Temperature
Dust and Water Proofing
–20 ºC to +50 ºC (–4 ºF to +122 ºF)
Power Supply
Internal battery
Operating Time with one internal battery
Models with two internal batteries
Li-Ion, 11.1 V/5.0 Ah
Approx. 6 hours
Approx. 12 hours
External Foot Connector
Wireless communication
USB cable connection and external power supply
Bluetooth® (optional)
Internal Battery
5.0 kg (11.0 lb)
0.7 kg (1.54 lb)
0.3 kg (0.66 lb)
Robotic Specifications
Robotic Operation
Maximum Robotic Range
Point Precision at 200 m (656 ft)
Maximum Search Distance
Search Time (typical)
300 m to 800 m (984 ft to 2,625 ft)
<2 mm (0.007 ft)
300 m to 800 m (984 ft to 2,625 ft)
2–10 sec.
Internal/External 2.4 GHz, frequency hopping, spread spectrum
GPS Search GeoLock
GPS Search GeoLock™
360º (400 gon)
Full robotic operation range
Data Collection
Control Units fixed on alidade
Face 1 (optional)
Memory (data storage)
Field App. Software
3.5″ TFT color touch screen, 320 x 240 Pixel, backlight
Alphanumeric keypad
128 MB RAM, 1 GB Flash
Survey Pro and Layout Pro
Face 2
6 lines, monochrome, 96 x 49 Pixel, backlight
4 keys
Instrument Software Functions Change Face, Radio and Instrument Settings, Measurement Value Display, Levelling


Download the FOCUS 35 Brochure here

Technical Information
FOCUS 30/FOCUS 35 Field Calibration with Survey Pro