[robski]

Yet another angle on this problem this time just considering the Pixel point of view.

We have 3 models of camera fitted with the same lens and shutter speed, a full frame, a 1.3 crop factor and a 1.6 crop factor.

A person is the subject in this case and stands at an appropriate distance from each camera so that their image just fills the frame in each case. From each camera we want to make a 10"x15" print at 300dpi so that we should have 3 identical looking prints to compare the camera shake. Again as in our previous examples we have a 1mm vertical movement for the camera shake.

The attached Table shows the figures for each model of camera to produce the print and the number of pixels the movement blur is over.

For the 1.3 crop factor the blur is 1.3 times greater than the full frame model.

For the 1.6 crop factor the blur is 1.6 times greater than the full frame model.

Therefore sensor Pixel density has no effect on the observed blur on the print.




In Peter's Post #6 he is cropping the area of the sensor and using the same scaling factor
so his statement is true in this case.


When you look at the world at the atomic level things are never completely still so in theory you will never get 100% camera shake free image. This is partially true in the field of measuring things, you are unlikely to get 2 measurements the same. So what we do is take hundreds of measurements and perform some analysis on the numbers to get a realistic value.

For much the same reason Camera sensor noise will never be zero (unless you want to operate at -273 degree C or 0K) it is a question of reducing it an acceptable level.

It really is a question of getting acceptable sharpness, i,e sharper than the eye see, when the eye can perceive blur it becomes unacceptable.