We also performed a more standardized test to more closely compare the clarity between each pair. This was tested by using an ISO 12233 chart. The chart was downloaded and printed on a piece of 11x17 paper at 1200 dpi resolution. By viewing the same set thing through each pair, we were able to more closely evaluate the differences between each pair.
We then viewed this chart through each pair of binoculars at a specified distance and noted how well we could read the different zones of the chart. The best and clearest pairs allowed us to see 10 zone clear and crisp and we could make out the lines. With other pairs we started to notice blurriness and purple fringing and color aberrations around the edges.
We also repeated this test using a more real world scenario. For this we purchased two model birds (that we affectionately named Garry the goldfinch and Barry the bluebird) and placed them in a tree. We then observed the birds through each pair of binoculars. we mounted the binoculars on a tripod for this test to ensure each pair was in the exact same position. We also took photos through each pair of binoculars so we could more easily make side by side comparisons.