I right now have a Tamron adpatall 2 70-210mm F3.8 lens. I am starting to realize for some situations the lens is a bit on the larger side, which makes it a bit inappropriate/large to carry along(concerts, q&a sessions, and so forth). Really like the lens for birding and wildlife as it is at f3.8 at the long end. Now I am staring at two options. The first one would be to keep the lens, but sort of compliment it with the Oly 40-150mm(R version maybe?), or maybe even Panny 45-150mm if I can find a really nice deal for it. The other options is ebaying the Tamron lens, and getting the Panasonic 45-200mm for wildlife, and the other situations it would come in handy. The down side here is at the long end it would be at f5.6, which is about half a stop shorter. Both in the use market would cost me under $200, which would be really easy on my wallet. Not sure what would be the better option for me. Thank you.