Liked https://i.imgur.com/VEby3pp.gifv
Focal Length vs. Distance To An Object
<blockquote class="imgur-embed-pub" lang="en" data-id="VEby3pp"><a href="https://imgur.com/VEby3pp">View post on imgur.com</a></blockquote><script async src="//s.imgur.com/min/embed.js" charset="utf-8"></script>