Gobo guides

Updated 8 October 2026

What you need to know before ordering a custom gobo, written for lighting designers and production electricians. Each guide cites the maker or manufacturer pages it relies on.

• Keystone correction for gobos
  Why an angled throw stretches the image, when to correct it, and the numbers a gobo maker asks for.
• Gobo sizes
  A, B, M and E sizes, their outer diameters and image areas, and which common profiles take which.
• Preparing artwork for the gobo maker
  File formats, vector or bitmap, resolution, and what Rosco, Apollo, Goboland and Projected Image publish.
• Steel or glass
  Bridges and letters that fall out, glass types, heat, and how to choose.

Ready to make one? Open Gobo Designer: it is free and runs in your browser.