BOB KISS wrote:
Forgot to mention (before Richard pounces)...in reality all of the distances regarding the lens are measured from the entrance and exit pupils of the lens which are not necessarily the same as the physical surfaces of the lens.
You don't need Richard for this.As a matter of fact, for this kind of calculations, the distances should be measured from the front and rear nodal points of the lens, which are rarely the same as the physical surfaces _nor_ the entrance and exit pupils of the lens.
- Regards Helge Nareid ============================================================================================================= To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.