I have been studying bass now for about 8 months. I am almost 5'1" tall. I played a 3/4 for a few months, tried a 5/8 at a shop, but now play a 1/2 size. Although it's not as loud as the 3/4 I can actually play it! With the peg up about three inches my hand bow pretty much reaches past the finger board. I don't get cramps in my hands after 10 minutes of playing. I am an adult beginner, and enjoying playing all sorts of styles of music. I play standing up, and don't know how to play using a stool yet. I could reach all of the notes in 1/2 position with on the 3/4 sized bass, but had to put the peg up for my bow hand to be low enough to play in the right place. This caused my left hand to be about 7 inches higher than the top of my head. This half feels like butter when I play on it. I start my first adult orchestra rehearsal next month. Let's see who picks on me first? haha My teacher at first didn't think the 1/2 was a good idea, but at the first lesson I brought it, he said that it really did seem better for me. I think it's going to be interesting when I learn to play more notes. Just at D it's feeling like violin finger close. but my ring finger size is a 4 1/2. I am not huge, just have a span. I am renting right now, but I am seriously considering purchasing a hybrid half-sized bass next year. Am I making a mistake? Do adults actually play half sizes?