Want an ultra thin and lightweight lens for your APS-C Sony E-mount body? Your search is over. This pancake lens (haha, get it? No seriously, that’s what they’re called) makes a fantastic walkaround lens because of its ultra-slim profile and 35mm equivalent focal length of ~30mm. That makes the Sony E 20mm f/2.8 an ideal lens to rent for travel, especially if you’re worried about taking up too much room in your bag. You know, since it’s basically the size of a lens cap. Fortunately for you, Sony didn’t sacrifice image quality to get that tiny profile. Its metal finish keeps it sturdy and the rear focusing mechanism means that the lens doesn’t extend itself while focusing.