Hello MD,
Some time ago I asked about the number of lenses inside a fixed magnification scope vs. a variable one.
Conceptually, as far as I know, there is no need for more lenses inside a variable. As I see, just changing the distance between the erector lenses, the magnification is changed. Of course, the variable scope needs one more tube that moves inside the simple one of the fixed magnification scope, with the elicoidal opening and all the parts to variate the relations between the erector lenses.
This is, as I said, conceptually speaking. May be some more lenses inside the variable are needed because some additional optical corrections must be made to compensate the erector lenses movements...?
Can you comment about all of this?
Thank you !
PH
