swarovski on a clear is best. swarovski had a tendacy to blur on bright days and will distort the picture.there are 3 brands along the quality you are looking at. swaronski,leica,and zeiss.leica is made with eyes galls lense glass. i went with these because they stayed clear in more areas. just like the other gentleman stated ,it is like apples and oranges.i can look thru the leicas all days and my eyes never get tired or strained