Where is "infinity". I suppose we'll find out when we pop our clogs.
For a lens where you can adjust the point of focus...and the f stop / iris, you can vary the 'depth of field'. ie that only which is in focus/ sharp to view within that range of distances
I my case I got 'distance' lens replacement, which has given me a 'depth of field' for a region of sharp focus capability from 12" to as far away as you can see with the human eye from this planet ..eg sharp stars ie at infinity.
A large format aerial camera has a fixed focal length for imaging distant objects..ie the ground 2 miles below...but far enough away to be regarded as 'infinity' from that perspective.
With this camera, for a vertical air to air shot, with a very small iris, one can work out the depth of field...since you cant 'focus'/ change the lens position. The subject aircraft can then only come into the range near the close limit of focus say 200ft , any closer and the image will be unsharp.
Perhaps the 'beyond infinity' result means that lens was wrong for the users needs.