So I've been using this camera for a few weeks now and I use 400 film and my ISO/ASA is at 400 as well. I never change my settings but somehow some of my photos come out under exposed. Do i need to change my settings up to 1000 when shooting outdoors in the day or should i lower it to 200 or 100? Shooting indoor is fine with the flash on, but outdoor gives me underexposure issues. I've added a photo of 2 that were underexposed and 2 that were fine, they're from the same roll of film and same settings. If anyone has any advice for me that would help me out a lot because i really like the feel of this camera.