The iPhone XR, famously, does not have a telephoto lens. David Smith worked out a way to see how often he’s used the telephoto in the past, with his iPhone X:

I’m trying out the XR, but was curious how much I’ll actually miss the telephoto lens.

I realized I can check using a smart album in Photos on the Mac. For me the telephoto was used in only 16% of my iPhone X photos. pic.twitter.com/N3YRjp4cFL

— David Smith (@_DavidSmith) October 29, 2018

In a nutshell, he jumped into Mac Photos and created a smart album based purely on focal length, which eliminated all but images taken with the telephoto lens. Very smart.