Olympus M. Zuiko Digital 40-150mm f4 PRO ac adapter B+W 010 UV-Haze MRC F-Pro

B+W 010 UV-Haze MRC F-Pro filter for 82mm filter threads

But it may be worth the tradeoff to pack this much magnification into a normal-sized camera bag

but it's designed for crop cameras

but here presented in a Nikon mount

Also: a large padded laptop compartment

Olympus M. Zuiko Digital 40-150mm f4 PRO ac adapter B+W 010 UV-Haze MRC F-ProThe Olympus M. Zuiko Digital 40 150mm f4 PRO is a relatively compact telephoto zoom lens from Olympus' premium PRO line. It's substantially smaller than the f2. 8 version (only about 10cm collapsed) and only loses one stop, which is not too bad! In excellent condition, with clean glass and good function. Includes hood.