APSC Lens on a 5D IV

[csharp80]

I saw a video recently where a SIGMA 30mm APSC lens was used on a Sony A1. Does anyone know if its possible to use a 30mm APSC lens lens on a 5DIV?

[Peter]

The mirror may be in the way if you mount EF-S on a full frame DSLR from Canon.

[kvbarkley]

This may be possible with a third party APS-C lens, but a Canon EF-S lens will not mechanically fit on an EF mount. The question is "Why?", it is so much easier to add vignetting in post.

Also pay great attention to Peter's post.

[csharp80]

As I looked closer at the video it was a Sigma 30mm DC DN being used on a Sony A1 not a 30mm DC. My question has been answered.

[Tronhard]

Don't even TRY to put an EF-S lens on a FF body.  You can damage the mirror mechanism because the lens protrudes in the main body of the camera much more than an EF lens.   I have seen people break their mirror in trying to do so.