Starrett optical comparators provide a time-tested, cost-effective solution for non-contact measurement. In this easy-to-learn technology, the image of a part is projected on a screen at a precisely known magnification. Measurements can then be taken off the image by moving the system’s X-Y stage, or the image can simply be compared to a transparent overlay. Our optical comparators combine mechanical stability with precision optics and versatile lighting to produce bright, sharp images and exceptional accuracy. We offer models in different sizes, with horizontal or vertical projection, lenses for magnifications from 5X to 100X, fiber-optic or video
edge detection, manual, motor-driven or CNC workstage travel, and choice of digital readouts and PCs. Our proven mechanical designs are now enhanced with the latest metrology software for unmatched flexibility and productivity.

“Our optical comparators produce bright, sharp images and exceptional accuracy  .”

Starrett HD400 is a dual-lens bench-top horizontal projection comparator, with a 16″ diameter screen, a vertically correct image, 16″ x 6″ of stage travel, a high 110 lb workload capacity, and ultra-bright lighting. A two-lens slide allows instant switching between two magnifications. Available with fiber-optic or video edge detection, this comparator provides performance previously only available with floor-standing models.
Video Edge Detection
The HD400 can be converted from optical comparator to vision metrology system operation when the Starrett OV2 Optical Video Adapter is installed in place of one of the two lenses in the lens slide. This provides the ultimate system flexibility.

• 16″ (400mm) diameter screen with cross-lines, overlay
clips and hood
• Dual mirror design for vertically erect image
• 21.3″x5.1″ (540x130mm) stage surface
• 16″ x 6″ (406 x 152mm) XY stage travel, 2″ (50mm)
focus travel
• 110lb (50kg) maximum load capacity
• Dual lens slide for instant magnification changes
• All metal construction for optimum stability
• Fine adjustment for X and Y axes
• Fast traverse, zero backlash mechanism for X-axis
• Heidenhain glass scales for 0.00002″ (0.5μm) X and Y
• Helix angle adjustment with ±15° Vernier scale
• 250W quartz halogen surface illumination with fiberoptic
• 150W quartz halogen profile illumination
• 10X, 20X, 25X, 31.25X, 50X, 100X projection lenses
• Fiber-optic edge detection
• OV2 Video Adapter for video edge detection
• Manual, motorized or CNC stage motion control
• Choice of Metlogix digital readouts, miniPC
computer with MetLogix M2 software, or all-in-one
touch-screen computer with MetLogix M3 software

MetLogix M2 Software on miniPC with, color touch-screen (15″), 2D geometry software for point, line, circle, distance, angle and skew. Windows® 10 operating system and Wi-Fi network connectivity for import/export of CAD files and data. Supports optical edge detection and CNC control.

MetLogix M3 on an all-in-one PC or miniPC. All features of the M2 tablet, but with a larger 21.5″ touch-screen.Supports both optical edge detection and video edge detection.

Metlogix MX200 Digital Readout. Monochrome LCD screen (7″Colour 1024 X 600 LCD, with an LED backlit capacitive
touch screen.), sealed metal housing, 2D geometry software. Supports optical edge detection.

HD400 Dimensions
Gross weight: 375lb (170kg)
Net Weight: 320lb (145kg)
Shipping dimensions:
47″x32″x50″ (120x80x127cm).

HD400 Optics
The HD400 is available with a choice of seven projection lenses and the Starrett OV2 Optical Video Adapter, a video camera which can
be installed in place of a projection lens to provide video edge detection (VED). All lens assemblies and the OV2 are mounted by a
bayonet fitting, which allows quick changeover between magnifications or between optical projector and VED operation.

Lens Selection Guide
Magnification 10 20 25 31.25 50 100
Screen diameter 16”
Field of View 1.6″ (40mm) .8″ (20mm) .6″ (16mm) .5″ (13mm) .3″ (8mm) .16″ (4mm)
Working Distance 3.1″ (80mm) 3″ (76mm) 2.5″ (62mm) 2.2″ (57mm) 2″ (50mm) 1.5″ (41mm)
Max Dia: Half Field 9.5″ (245mm) 10.3″ (263mm) 10″ (253mm) 7.1″ (185mm) 4″ (106mm)
Max Dia: Full Field 7″ (180mm) 8″ (200mm) 10″ (250mm) 9″ (234mm) 5″ (125mm) 3.9″ (98mm)
Projected Image  Vertically Correct

Field Of View Terminology
Working Distance: Is the distance between the objective lens and the component when the component is in focus
Field Of View (FOV): Is the viewable area. To fill the 16″ (400 mm) diameter screen when using a 10x lens, the maximum diameter                                           object projected would be 1.6″ (40 mm).
Half Field View: Is the maximum size a component can be projected to the center of the screen before colliding with the lens.
Full Field of View: Is the maximum size a component can be projected over the full screen before colliding with the lens.
Projected Image: Is how a component is projected onto the screen in relation to its placement on the workstage.