Gas pressure effect on lens to affect focus
Posted: Wed Jul 15, 2015 12:27 am
Just food for thought -
Has anyone tested or run the numbers to see how far a lens might deflect under high gas pressure?
And, how far would that deflection move the focus point?
I wonder if that would help explain some of the rules of thumb regarding focus height when cutting various materials.
Seems like most materials that 'want' a low focus are also being cut at high pressure.
Obviously, lens diameter and thickness would affect the focus change at a given pressure.
Regards
Robertlago
Has anyone tested or run the numbers to see how far a lens might deflect under high gas pressure?
And, how far would that deflection move the focus point?
I wonder if that would help explain some of the rules of thumb regarding focus height when cutting various materials.
Seems like most materials that 'want' a low focus are also being cut at high pressure.
Obviously, lens diameter and thickness would affect the focus change at a given pressure.
Regards
Robertlago