A picture may be worth a thousand words, but a picture with bad lighting will be discarded with little notice. There is an app that will guide you through DSLR settings in different lighting situations. Going by the name Pocket Light Meter, this free app uses the iPhone’s camera to detect the current lighting, and tell you what shutter speed, f-stop and ISO settings to select on your DSLR. The problem being, you have to hold your phone up to assess the lighting situation, then pull out your camera, adjust it, and by the time your ready to click the button the moment is gone.
A camera and DIY geek named Nigel created a hotshoe specifically for the DSLR so that your iPhone can be mounted onto the camera. Leave the app up, put it in the mount, and adjust accordingly. This is a very simple design that is likely going to lead to some amazing photographs. Want to make one for yourself? It looks pretty simple, and there are full instructions on the creator’s website.