Doesn't the name 'Petzval' refer to the actual optical design - which therefore should fundamentally be the same across all lenses carrying the name? There are of course different focal lengths, and as you said, lenses without aperture, with an iris and slotted for Waterhouse stops, as well as lenses with a helicoid for (fine) focus adjustments. AFAIK at least - correct me if I'm wrong.
Hi all, I'm familiar with the kind of image a Petzval lens will make; how would the projection Petzval's images be different? Given the same maximum aperture and same focal length, are there any significant differences in the images there two lenses make? I know that the projection Petzval...