My wife was having a terrible time using her Canon Powershot ELPH 100 P&S camera because she cannot see the image in the LCD viewfinder when in the bright sun, especially if the sun is behind her.
I purchased this accessory to help her:
http://www.ebay.com/itm/2-8X-3-0-LCD...8AAOSwzJ5Xdpmk
The magnetic frame fits on her camera using double stick tape and the viewfinder extender snaps into place and stays there but, is easily removed without the use of tools. Sure it makes the camera a bit bigger which doesn't hurt at all as far as holding the camera steady goes. She seems to like the accessory.
Using the viewfinder really helps me view my images on the LCD of my DSLR cameras. I don't add the magnetic frame. I simply point my camera down and place the accessory on top of the LCD.
Hoodman has been marketing a hood like this for years to fit on DSLR cameras. However, the price has been around $80 USD or so. The viewfinder that I bought my wife for her camera cost $3.77 USD with free shipping from Hong Kong to the USA. The Hoodman hood is a bit more sophisticated but an eighty dollar hood for a fifty dollar camera is overkill