[G4 General] rifievans:
Paid hobbiest photographer here, I thought I'd share my knowledge of photography and give an opportunity for others to do the same:)

For pictures on the G4, they are can have the opportunity to be amazing. Let me start off by saying that LG did an amazing job with their auto mode. Whenever there is a large contrast (sun behind a mountain for example) I use auto for the hdr. When in doubt, use auto mode. The results are almost always stunning. (I also use auto for landscape pictures when it's a large subject, like a meadow for example)

That being said, there's another level that it can be taken to with manual mode. Let me explain each function from left to right.

WB: White balance - This option controls how "warm" or "cold" your pictures are. This is the most confusing option, and also the hardest to explain. Basically the lower the number, the more white your light source is. Thankfully LG put in recommendations as to what to set the white balance at based on your light source, but ultimately it's up to your personal tastes. One of the best things about this is that you can see the effects of changing the white balance on real time, making it easy to select your preferred look. I commonly increase the white balance on order to get a more saturated picture, with brighter, more vivid colors (but that's just my preference). White balance is one of the easiest to change in editing however, so I wouldn't worry too much about it as of right now.

MF: Manual Focus - This option is something I tend to leave alone, because of how well the laser focus works. As the name implies, this setting controls the focus of the camera. I find it useful in very close-up situations where the auto-focus is struggling to set, or when you want to focus on a specific object in your scene. Due to the laser auto-focus however, I mostly leave this alone, especially because it's easy to be just a tad off, and is impossible to fix in editing.

+/-: generic exposure - the only way you can have this enabled is if you uncheck "AE-L" on the far right. Adjusting this makes your pictures lighter or darker. Rather then messing with the iso and shutter speed yourself, the phone does it for you. I can honestly say I have never used this, mostly because I have a certain object I want to capture that requires either a fast shutter speed, or low iso.

ISO: Sensitivity to Light - A very useful tool, and completely foreign to the smartphone world (I think) until the LG G4. This is mostly changed based on what type of picture you're trying to capture. No matter what picture you are taking however, A LOWER ISO IS ALWAYS BETTER. While a higher iso will allow more light to be captured resulting in brighter pictures, it will also increase the "noise" or the graininess of the picture. Normally if I'm taking pictures of landscape or a still object, I'll keep the iso at 50, but at a maximum of 150 in order to keep the image clear and sharp. If I'm taking a picture of action or I'm trying the stop the motion I'll go up to an iso of 700 (but once again it's up to your personal preference)

S: Shutter Speed - one of my favorite things about this phone is being able to set the shutter speed. The longer the shutter speed, the more light will be able to get in. However, as a trade off, it's harder to keep the phone still, and anything in motion will show up blurry. A faster shutter speed will stop motion, meaning you can get really cool action shots, or freeze pretty much anything you want. The downside of this being normally you have to turn up the iso in order to compensate for the lack of light, meaning a grainier shot.

AE-L: Exposure Lock - All this does is toggle whether or not you want the camera to change the shutter speed and iso or not. As soon as you change the shutter speed or iso, the toggle is switched and the phone will not adjust these settings until you press the toggle.

Hope this helped:) let me know if you would like specific examples of how to use the shutter speed and iso to take some really cool shots!

-rifievans