Early Petzval lenses suffered from terrible chromatic aberrations; Since daguerreotypes are only blue sensitive this was less of a problem than it would be today with panchromatic film, but there was notable focus shift. By the mid-1840s most Petzval lenses had been redesigned (achromatized?) which reduced chromatic aberration, and removed focus shift. Now, the adjustment was for ortho materials so there may be a residual affect.

I have used Petzvals from the 1850s with modern film and have not noticed any focus shift. I have seen some banding and other signs of chromatic aberration. Of course these lenses were ground by hand, so each is unique and has its own "personality" (read; aberrations)

jason