A Quick Visual Reference of How Much Light a Full Frame Sensor Absorbs Vs an APS-C Sensor

While testing out the Rokinon 50mm f1.4 AF for the Sony a7r III and the Fujifilm X-H1, I was shooting with f1.4 lenses on both cameras. When exposing scenes at ISO 6400 and shooting wide open at f1.4 with similar metering, I came across something that I found was pretty crazy. To verify it, I showed it to a buddy of mine who works for a pretty famous camera store. When he saw it himself, he was pretty shocked. I knew for years that full frame sensors tend to absorb more light per pixel and have ...