Can someone help explain this to me?
1. A lens' focal length is measured in terms of it's distance from the sensore/film plane correct?
2. FF lenses are designed so that the projected circle of light is optimzed to make contact with the full sensor/film frame correct?
3. DA lens' projected circle of light is smaller due to the size of the digital sensor correct?
So now I am just thinking out loud using my 1st grade experience of what happens to sunlight as I move a magnifying glass closer and farther away from a dry leaf. Usually the type of optics I deal with are the laser variety...
Why not design a body that allows for the movement of the sensor plane to be closer to the lens mount when a DA lens is attached to achieve the same size circle of light as a FF lens? Obviously the body would need to be larger and you may need a special viewfinder to have the correct adjustment for focus but is there a reason why this wouldn't work?
Again this is coming from my very basic novice understanding of SLRs in general so if I am way off base please do not flame me, please just tell me why it wouldn't work so I learn something new today