Originally posted by Mistral75 ^ I have in the past, with film cameras.
The case I imagine that approach might work would be a super-wide to normal zoom where the magnification at the wide end is so low as to make manual focus difficult with the long end offering an advantage. That case is one reason why I use an aftermarket split-image focus screen where the split-image is still functional even with the diagonal FOV at 180°.
Of course, the rub comes in regards to the practical definition of parfocal. While many designs may approximate such, it has been my understanding that one must go to a dedicated cinema zoom to find a lens that actually provides a robust delivery.
Steve