cusp,
you have an 3.5x lens????? I don't remember orascoptic giving us that price at our school. Why such a high mag? Is it to correct for your vision?
Doggie,
I've heard great things about the Zeiss loupes lens. The problem is though, they only have flip ups and not through-the-lens. I have a pair of Zeiss loupes right now, and they're ok. I think I would like the TTL better because they give you a wider field of vision than the flip-ups. Plus, TTL are a little lighter.