Cheapest parfocal lenses In: Cameras Posted March 30, 2019 The Sigma Art 18-35mm F1.8 is parfocal. Same glass as its Cinema cousin. Buy a gear set from followfocusgears.com and you're ready to go! https://www.amazon.com/Sigma-18-35mm-F1-8-Lens-Canon/dp/B00DBL0NLQ/ref=sr_1_3?keywords=sigma+18-35&qid=1553964868&s=gateway&sr=8-3 https://followfocusgears.com/collections/sigma/products/seamless-follow-focus-gear-ring-for-sigma-18-35mm-f1-8-sigma-art-lens?variant=21512634400851 I just got one a month or so ago and can confirm it's parfocal. Here's a short piece with video about it: https://eriknaso.com/2013/11/02/sigma-18-35-parfocal-test/ You should know the lens does not have IS though.