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?

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    If you use the camera to take a picture of a ruler, you can then measure the distance between the glass covering the camera and the ruler to make a start on your project. However, unless you are controlling for the 3D position and alignment of whatever you are measuring, you might find distortion and off-axis positioning have measurable effects on the image rendering even assuming you have a parallel placement of whatever you are measuring (both vertically and horizontally). – bmike Mar 11 '13 at 12:54
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    I'm using OpenCV for the project. Specifically, I'm looking to find the apertureWidth and apertureHeight parameters for the calibrationMatrixValues. Rereading the documentation, it looks as though these parameters are poorly named as they're actually looking for the physical width and height of the sensor. – bjornsen Mar 11 '13 at 14:39
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    Makes sense - we will be a good place for people to help document what hardware is used, but if you want to ask that exact code level question on our coding site, Stack Overflow would be a good place to ask if other developers have found good values you might be able to reuse rather than engineer a solution. – bmike Mar 11 '13 at 16:16

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.

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    That's not an appropriate answer. Unfortunately its hard to find the Specs. Its important o know the Aperture size / Sensor / Pixel Size / Focal Length / ISO etc. for specific studio interview requirements. – Daniel Airth-Nelson Oct 11 '17 at 19:02

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