I think the other Steve is referring to mechanical things like scissors machine shop equipment, not necessarily lenses. I agree with him in principle that most mechanical things are fairly impervious to storage orientation... unless there are affiliated issues like leakage of fuel or oil lubricant. Polaroid film was an exception (although some might think it too simple to be considered "mechanical") because if stored on end the chemical reagent would pool to one side and not spread right. In that case storing flat, as indicated on the box, was rather inportant.
Originally Posted by Sirius Glass