I'm working on a project where I need to convert from pixels to mm and need to find the aperture or sensor size on the FaceTime HD Camera. Specifically, I have the mid-2011 27" iMac. I can't seem to find any detailed technical specifications on the newer FaceTime camera. Anyone privy to these details?
tl;dr - As a starting off point, eyeballing it I'd estimate around ƒ/2.2 - ƒ/2.8 aperture.
This isn't an exact answer, I put the iPhone 7+ front camera (which has a ƒ/2.2 aperture and a 'focal length in 35mm' of 32mm) next to the 720p FaceTime HD camera on a macbook. Eyeballing it, the image on the mac seems to be the same or maybe ~5% smaller in FOV. So I estimate around ƒ/2.2 - ƒ/2.8 , maybe ƒ/2.4 in aperture.
On the iMac's features page it is stated that:
The built-in 720p FaceTime HD camera lets you make video calls that are so clear, it seems like everyone’s in the same room.
This means that the FaceTime HD Camera can offer you a 1280x720 resolution as a hardware maximum, but, it's the software you'll be using it with, which will decide the resolution.