While on a recent trip to the Oregon Coast, we stopped by a glass shop. I hadn't planned on taking many pics, but the owner started putting on a demonstration shortly after we arrived. Luckily, I had my Canon A-1 with me, so I quickly loaded it with some HP5+.
The light inside the building was constant but a little on the iffy side. A curtainless window on the opposite wall would have thrown the internal meter off by quite a lot. Rather than taking the time to get my exposure reading on each frame I just set my shutter speed to 1/125 and aperture on the 50mm f/1.8 to f/2.8. Afterward, I checked the light levels with the metering app on my phone. Turns out I was at EV 6. I was effectively shooting at ISO 1600, well within the pushing limits of this film.