How Much Changes Are There Between Launch Conditions?

There's a really clean relationship between launch and spin. High launch correlates with low spin on wedges and on irons. The other perspective to look at that is if you have a three degree change in launch angle, how much would you have to change the loft on your irons to do that? And that'd be like five degrees. It's another way to think about how important it is to fit club and ball together.