In a recent MobileMovieMaking interview, Indian director Syed Ahmad Afzal discussed the challenge of shooting smartphone video in low-light situations. Doing so, he explained, results in grainy (noisy) footage that must be corrected in post-production.

The technical issue involves ISO, a measure of a camera sensor’s light sensitivity. If you want to learn the basics of ISO, check out Jack Hollingsworth’s one-page Beginner’s Guide.

Currently, the iPhone’s maximum ISO is 2000. This is far less than what’s available on high-end DSLR cameras. The good news is that  the situation is about to change. This summer, Sony will release its xperia-XZ2 Premium, which boasts a maximum ISO of 12,800 when shooting video.

Odds are that Apple, Samsung, and other phone makers will follow Sony’s lead.