I would think resolution is a negligible difference. Unless it's extremely low 
res it's pretty easy to determine what is in focus and what is not.

Paul via phone

> On Mar 8, 2015, at 3:52 PM, steve harley <[email protected]> wrote:
> 
>> On 2015-03-07 12:03 , John Francis wrote:
>> 
>> The basic problem is you have three defining factors to consider.  They are:
>> 
>>   1) The size of the subject you are tring to capture
>> 
>>   2) The size of the final image you are trying to create
>> 
>>   3) How far away from the subject you can place the sensor
> 
> doesn't the resolution of the film or sensor figure in?
> 
> in other words, assume system A can resolve details to 0.01 mm on its film or 
> sensor, and system B can only resolve 0.02 mm details … won't the effective 
> depth of field be larger on system B, simply because with its lower 
> resolution you can see less difference between perfectly focused and slightly 
> out-of-focus details?
> 
> 
> 
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