A few months ago I saw ads pop up on social media for Lensball. At the time I didn’t know how good they would be and my summer adventures had just ended so I didn’t order but was later gifted a ball (unbranded) the ball I got was 30mm so one of the smaller sizes. I got to use it a bit over the last couple of weeks and have already put in an order for one of the larger 70mm balls.
While the clarity isn’t quite there with the smaller ball size I think there would be some great results with the larger photo balls. I have also ordered a selection of sizes for students to use as part of their Everyone Can Create Photography assignments.