I almost gave it a bad rating and was about to delete the app from my iPhone, but luckily, by trial and error, I figured out how to work it. Nice app! :) When you open the app, it only accesses one camera at a time, not both simultaneously, which I expected because of the app’s series of screen shots in the app store. So far, there are no instructions provided. In the dual screen, it accesses EITHER the front OR the back camera, and before shooting, you can adjust the size of home much of the dual photo’s frames will be from the first shot you take. The frame for the 2nd camera remains BLANK, with just an icon, until AFTER you shoot a photo from the opposite lens. The app displays the photo shot from the first lens, and then you shoot a photo from the opposite lens. Afterward, you can use an optional filter, and save the photo, which is a combined “split screen”. Landscape mode fix: Oddly, by default in the settings, "Anti-flip" is set to “OFF”, so when shooting in landscape mode, the front-facing camera always FLIPS your selfie shot UPSIDE DOWN, no matter how you angle the camera when shooting. You need to turn the anti-flip setting “ON”, which should be the default setting. Advice to developer: Make anti-flip the default setting. Also, provide detailed instructions or a series of screen shots which illustrate the actual process of shooting one photo at a time from each lens. Feature request: It would be nice to have the ability to use a separate filter on the view from just one lens, instead of only being able to apply one filter to the combined photos.