I picked up a demo Zeiss Victory HT 2.5-10 ASV for hunting, these don't have SF. The factory parallax setting is 100 m but I'd prefer it to be at 300 yd. I presume it could be sent in to Zeiss to have it changed but if it is a straightforward DIY project I would do it to save time and money. I've changed Leupold parallax zero settings before, its easy to remove the outer objective ring and rotate the objective holder. But I don't want to experiment on this scope and thought I'd see if anyone has heard of it or changed parallax settings on a Zeiss.