When touching the smartphone to the camera, be careful not to drop the camera or smartphone. Do not touch the smartphone to the camera with too much force. Doing so can scratch the camera or smartphone. Just holding the smartphone close to the mark may not establish a connection. Be sure to touch the mark with the smartphone so that they come into contact with each other.
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About camera GPS Some have an internal sensor. Others use Canon Camera Connect (CCC) which is a unified app that connects your iOS or Android mobile devices to cameras equipped with Wi-Fi or Bluetooth. GP-E2
Solution You can display the electronic level on the LCD monitor and in the viewfinder to help you correct camera tilt. Displaying the Electronic Level on the LCD Monitor
After detaching the lens from the camera, put down the lens with the rear end up and attach the rear lens cap to avoid scratching the lens surface and electrical contacts.
You can use the Digital Photo Professional Ver.4.x tool palette to erase dust and other marks in a shot image and to correct an image by copying part of the image and pasting it onto an unnecessary part of the image. Note that you can use the functions in this tool palette with JPEG and TIFF images as well as RAW images.
Tips for taking sharp and crisp images - A deeper depth of field can help avoid out of focus images. The depth of field is the range of the image that is in focus in front of and behind the point of focus.