5D Mk IV – EF 50mm f/1.2L – 1/50, f/4, ISO 3200

I’ve been thinking about working and testing two different things: 1. the complex autofocus system on the 5D Mk IV, and 2. taking high ISO photos.

I take most photos (>95%) in the ‘One-Shot’ autofocus mode. I’ve noticed lately that I’ve been missing focus on some shots, so I’ve undertaken some self learning to better understand the AI Servo mode of autofocus. I think this will be a several week journey as I test various setting, but I started today. Maybe, unfortunately, I also decided to combine this process today with testing taking high ISO photos. I’ll go more into ISO in a later post, but in a nutshell, the higher the ISO, the more sensitive the sensor is to light. So in low light situations, a user can increase ISO and still capture an image. The problem is that the high ISO’s also lead to more grain in the picture.

For today’s Photo of the Day, I set the autofocus to AI Servo since Mason was moving his head back and forth slightly. Not a lot, but enough to throw off focus. I also took this shot without a flash and the ISO set to 3200. I think it came out pretty good (also considering the shutter speed was 1/50 second!). I look forward to more of this testing in the future.