the lens is bigger then the pre asph no doubt, a lot bigger, but at the same time I also think its ergonomically easier to use for as much as I hate lens tabs the one on the asph works just right for me. With the hood its even bigger. The rokkor is a small lens, about the same size as the 35 pre asph but I think a hair thinner if I remember. The Hexanon is longer then the 35 asph, but with the hood on the 35 they are give or take about the same size.