----- Original Message ----- From: "Mark Roberts" Subject: Re: Star lenses (was: Re: Reputable dealer?)
> "William Robb" <[EMAIL PROTECTED]> wrote: > > >I suppose it depends on if the term APO actually > >means something in the hands of the marketing department or if it is just a > >buzz word. > > I wouldn't be suprised if there were an actual definition somewhere, but > I'll bet only scientists working in the field of optics use it. In the > real world it's pretty much become a marketing buzzword, which every > lens manufacturer defines in a way their marketing department decides > upon. Well, there is an actual definition. APO is short for apochromatic, which in our context is a lens which focusses all wavelengths of light onto the same plane. William Robb
