RMI Laser


F-Theta Lens

F-Theta Focusing Lens Overview

Every Laser Marking System comes with an F-Theta lens. Different lenses allow you to adjust the size of the marking area, as many of our customers require more than one. The best lens for your project depends on the marking application and the workstation configuration. Please note that 532 nm have fewer options than the 1064 nm lasers and larger lenses (254 mm, 330 mm, & 420 mm) require higher wattage lasers.

Contact us to order an additional F-Theta lens.

F-Theta Focusing Lens Specs

100 mm F-Theta Focusing Lens


  • 60 x 60 mm 2.4 x 2.4" marking area
  • 85 mm 3.4" Diameter circular marking area

  • Average: 30 µm spot size

163 mm F-Theta Focusing Lens


  • 100 x 100 mm 4 x 4" marking area
  • 141 mm 5.6" Diameter circular marking area

  • Average: 49 µm spot size

165 mm F-Theta Focusing Lens


  • 105 x 105 mm 4.13 x 4.13" marking area
  • 188.5 mm 7.42" Diameter circular marking area

  • Average: 30 µm spot size

254 mm F-Theta Focusing Lens


  • 150 x 150 mm 6 x 6" marking area
  • 212 mm 8.3" Diameter circular marking area

  • Average: 76 µm spot size


330 mm F-Theta Focusing Lens


  • 200 x 200 mm 7.9 x 7.9" square marking area

  • 283 mm 11" Diameter circular marking area

  • Average: 99 µm spot size

420 mm F-Theta Focusing Lens


  • 254 x 254 mm 10 x 10" square marking area

  • 358 mm 14" Diameter circular marking area

  • Average: 126 µm spot size

Contact us if you have additional questions about ordering another f theta lens. 

Additional accessories:

Rotary Chuck Lite
Rotary Chuck Heavy Duty
Laser Safety Eyewear

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