I have IS 10x42 and 10x32. Tonight is a full moon, with clear skies here, and the moon rose at about 6pm. I took both binos out to look. Firstly and more obviously, the image through the 10x42 was noticeably brighter and sharper. This is not a criticism of the 10x32, which is no slouch. But the image through the smaller bino seemed...smaller. At first I though this was an illusion, so I checked by holding a barrel of each to each eye to compare. The image of the moon through the 10x32 was definitly 20 per cent smaller than through the 10x42. I'm not ocncerned, I love both binos. But I thought 10x should be 10x no matter what the objectives are. It seems the IS 10x32 are really the IS 8x32 of my dreams. This is good news, but I am confused.