I have read a few responses to "best telephoto lens?" postings and most ask for more qualification on what "best" means, so I will try to provide some additional context. I'm inexperienced and had abandoned the hobby (this is just a hobby for me) before going digital. I'm returning to photography as a hobby and have invested in an OM-D EM-5 kit with 12-55 ED M.Zuko EZ Lens. I will be going on an Alaskan cruise and want to get a telephoto lens for taking shots from the ship and while out hiking. I plan on investing in a trekking monopod to use on hikes. So with those parameters: novice, OM-D EM-5 body, wild life and landscape photos, supported from monopod… what would be the best telephoto lens option? Right now I am leaning towards the Panasonic Lumix G Vario 100-300 lens, mostly due to cost and because it is one step faster than the Olympus M.Zuiko 75-300 lens. Thank you for your responses, and any other advice would be appreciated – particularly on filters.