Quote:
Originally Posted by xelasnave
Originally there was duty on larger optics and by making them a little smaller the duty was avoided and the practice carried was still carried on even after the duty was dropped after WW2..no hang on thats not right as I just made all that up  ..
.I really don't know why the difference ..probably just following the original leader in the field and as with so many things " we do it this way because we have always done it that way".
There could be a reason based in optics.
Who was the leader way back? Maybe the EPs were similar to those in a sextant or something and pirated...
I wont sleep tonight of course. 
Alex |
I can think of a good reason but I'll reserve it till tomorrow.