I'll soon be purchasing my first dedicated macro lens. Budget: Max aprox 500$. Interest: Nature, bugs, flowers, etc. Body: d800. Looking at the Tokina 100mm, Tamron 90mm, Sigma 105mm and older Nikon 105mm. Leaning towards the Tokina because reviews are great for the price but I'm interested in your experiences with these lenses or others I might consider. I don't want wider than 90mm. ty!