I am going to one today..a smalll one, but one where they allow the full life cycle to take place, so I am likely to see larvae, cocoons, and the like.
I am thinking I will take my 55-300 and 35mm though I could take the 18-108...never gone out to do a deliberate butterfly shoot, so any advice would be graciously accepted.
I will take my tripod, though now wish I had a monopod.