This viewfinder is for sale at Amazon for £22.99 which is an amazing price. I decided that for this price it was worth a try, but was very sceptical - you know the saying 'if it looks too good to be true, it probably is'
Wow was I pleasantly surprised! The viewfinder arrived in a little cardboard box, no fancy packaging and no instructions - but it's straight forward what to do with it anyway. It comes with a little metal frame with some double sided tape on it, simply stick that to the back of your camera and the viewfinder then attaches to the frame via some magnets. The viewfinder stays on well, seems to be well made and works a treat. The big rubber eye-cap easily accommodates my glasses and the picture you see through the lens is fantastic. The inside is covered in a flock type covering that cuts down unwanted reflections. It's very easy to see the sharpness and it does steady hand-held shots considerably - this view-finder is highly recommended... They do two different versions depending on the size of the rear screen on the camera, so make sure you get the right one.
Buy them from Amazon here: