Cinema-photographers - I am in need of sound advice. Thirty years ago my small natural history production company made two documentaries on tarantula spiders - which have become classics (primarily, as you can imagine, they are very specialist niche) and today - can still be downloaded on a spider download website we have constructed. We filmed them with the bulky Sony video cameras of the day - and they look good as a download on tablets but awful on a HD TV. So we want to start all over again - making specialist tarantula spider documentaries. We intend to use two Canon 70D cameras on solid tripods - so no wobble - but what we want to know is what would be the best lens to use for shooting video with these camera bodies? It is going to be very hot and dusty and we will be operating in the back end of no where - so if possible we would rather not have to keep taking lenses off. Is there a good compromise lens where we can shoot habitat shots, talking head shots and tarantula spiders shots???? As we are talking tarantulas we are not looking at macro macro - but it would be useful to shoot decent size bugs - which would fit on the palm of your hand.