pseudonym58 . I'm often surprised at the way violin music is written, sometimes with six or more ledger lines! Very cumbersome looking. Why not an 8va?
Talk to violinists and you will find out why. For a violinist, the place of a note on the page is associated with a place on the string. There is no simple octave shift, as there is on a piano. The way a passage is written, with ledger lines, corresponds to the way it feels when you play it.
Here's a bit more on the subject of ledger lines:
This is from Elaine Fine's Behind Bars, which is, without a doubt, the best book on modern music notation.