optical alignment - 4KProjectorGuide

Troubleshooting

Why Your Projector Keeps Losing Focus

frequent focus adjustment needed

Could lens misalignment, dust, or aging components be causing your projector to lose focus unexpectedly? Find out how to fix it.

4KProjectorGuide Team
January 16, 2026

Illinois Just Passed A Law That Puts Linux On The Hook For Age Verification

Troubleshooting

Illinois Just Passed A Law That Puts Linux On The Hook For Age Verification

Illinois passes law requiring Linux-based systems to implement age verification,…

4KProjectorGuide Team
August 11, 2026

Parametron: 50S Japanese Computer That Uses Neither Transistors Nor Vacuum Tubes

Projection Basics

Parametron: 50S Japanese Computer That Uses Neither Transistors Nor Vacuum Tubes

A 1950s Japanese computer called Parametron, which operated without transistors or…

4KProjectorGuide Team
August 11, 2026

Tail-call Optimization In C Is Relatively Recent (2025)

Projection Basics

Tail-call Optimization In C Is Relatively Recent (2025)

C language developers implement tail-call optimization in 2025, a feature long sought…

4KProjectorGuide Team
August 11, 2026

Squeak 6.1

Audio & Integration

Squeak 6.1

Squeak 6.1, the latest version of the programming environment, has been officially…

4KProjectorGuide Team
August 11, 2026