If you want, tell me which AE version you're using and whether you have a Z-depth pass or only regular footage; I’ll give a concise step-by-step tailored to that.
: If your project has many missing instances, search the timeline for "Lens Blur." Delete the missing effect and apply Camera Lens Blur lens blur after effects missing free
: It is significantly faster than the built-in Camera Lens Blur and produces smooth, high-quality results without heavy render times. If you want, tell me which AE version
Some users attempt to "revive" the old effect by copying the Lens Blur.aex file from an older version of After Effects (like CC 2015 or earlier) into the Plug-ins folder of a newer version. Camera Lens Blur | Effects of After Effects Camera Lens Blur | Effects of After Effects
(Free version/presets): Sometimes bundled with hardware or available as specific free presets, Boris FX's version is highly regarded for its "Focus Target" features. 3. Legacy "Workaround" (Not Recommended)
For those who don't have access to After Effects or are looking for free alternatives, there are several options available: