For those of you who have never heard of a Hoodman Loupe I’m writing a post about them. They fit over the back of LCD screens on cameras without a viewfinder to let you focus and see clearly in bright sunlight. They pretty much fit any camera with a 3″ LCD back screen. The optics eyepiece is adjustable to dial in to your vision, should you ear prescription glasses. The one show below was just $79.95. Hoodman has always made the very best Loupes. Mine is 10 years old and works like new. http://hoodmanusa.com/cgi/commerce.cgi?preadd=action&key=HLPP3M
Use three of these inexpensive ponytail elastic bands to hold your loupe onto your camera, one around the loupe eyepiece and the other two connected to the loupe band and stretch around the front of the camera. Effective and cheap. Or you can buy the 3 black bands from Hoodman and spend $20. Your choice, $1.95 or $20.