i think this is out-dated theory based on what resolution a film slide had to be scanned at to give results similar to 35mm film..

in truth i think its erroneous misleading nonsense and teachers and those quoting it ought to stop living in the past..

it has been said and accepted that a modern digital camera does not need as many pixels as the theory suggests to produce acceptable results.. its more down to what the current digital technology does with its pixels than how many it has..

just my view on the subject.. but who am i to contradict people who teach for a living.. he he


trog100