Wild blueberries, an important fruit crop, have higher photosynthetic capacity than previously thought. Using different leaf chambers, researchers found that big chambers underestimated photosynthesis by 35-47%. The difference was likely due to leaf orientation and shading. The study suggests that chamber size affects measurements and provides guidelines for future research on small-leaf crops. Additionally, a relationship between Electron Transport Rate and CO2 assimilation was established, but caution is needed when using ETR to quantify photosynthesis.