> > Of course > what can be done without a laboratory and special equipment is a test > of the whole system, sensor+lens+shutter speed+ etc. Testing sensor linearity does not need a lens and it can be done using the same shutter speed. Monitor, exposure meter, and a neutral density filter is all one needs. Sensor (except special designs) is pretty linear within 10 stops. -- Iliah Borg ib@xxxxxxxxxxx