john_edwards wrote:
Here\'s a thought, and my knowledge of optics is zilch. If a thinner cover that can do just as well as a thicker cover can, it seems that if Sony moved the sensor toward the lens mount by the difference in thickness it would not degrade the lens performance. In saying this I\'m assuming lenses are designed to focus on the face of the cover glass and not on the sensor face.
And here\'s another question: while everyone is measuring the stack thickness is anyone checking the distance from the sensor face to the lens mount? Is the distance the same on all cameras, Nikon, Sony, and Canon?
I don\'t think your assumption about where lenses are designed to focus is right. I believe they are designed to focus on the sensor not the cover glass. The problem is that sometimes the cover glass interferes with good focus on the sensor.
The distance from the sensor face to the lens mount is called the registration distance and it varies with different types of lenses. For example a native E mount lens has a registration distance of 18mm, whereas a Canon EF mount lens has a registration distance of 44mm. That is why you need an adapter that is 26mm to use a Canon EF lens on an E mount camera. Just google \"camera registration distance,\" and you will find a list for many types of cameras.
Sep 29, 2014 at 11:18 AM
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