While testing out Device Preview (formerly Tridion Device Emulator), I found out that most if not all of the default device sizes are incorrect. Some are off by 40% or more. For example in Device Preview, the iPhone 5 has a default viewport width of 187px, however, in reality the iPhone 5 has a view port width of 320px. The sizes posed in the docs contain the same incorrect values as well:
It follows that the default device images provided with Device Preview are an incorrect size as well. Is there a specific reason why the defaults do not line up with the real world values? Is there a common place to get accurate device images, to update Device Preview with?
while it is true that you can update the device sizes to your desired values, the included images do not automatically scale, which means that in order to get Device Preview working correctly you need to find images of the correct size, or scale the included ones (not ideal).