A major problem that afflicts users of many digital cameras is when bright light reflects off of the cameras lcd monitor, often totally obscuring the image being shown. In conventional use the traditional optical viewfinder can be used. In digiscoping the view from the optical viewfinder will be blocked by the scope or the adapter itself, in any event you will not be able to focus the scope onto the subject nor read any vital exposure detail.
The Extend-a-View Pro is an alloy device with a 2x eyepiece incorperated into it that fits over your lcd monitor. It's held in place by narrow velcro strips , though only one strip of Velcro need be applied so as to create a hinge effect. This single strip of Velcro holds the Xtend-a-View securely enough, never having fallen off, even whilst the set-up is carried around. Obviously a coresponding strip of Velcro needs to be stuck onto your camera (just above the monitor), so it may be difficult to remove the glue in the future.
The Extend-a-View will fit many digital cameras as it's available in three sizes, the 'mini' will fit 1.5 inch monitors like that on the cp4500
The rubber eye-cup provides comfort to your eye and eliminates stray light from entering, not unlike looking through your scope in a conventional manner. The beauty of the glass eyepiece is that you can have your eye close to the monitor, traditional sunshades may cut out the light but your eye is too close to the monitor for you to be able to focus on it.
The view can be a little bit pixellated with the 2x magnification, though I have found the view to be good enough to get a precise focus with. The traditional technique of using the digital zoom of the camera to get a precise focus isn't really needed, this is just as well as the view would be quite poor.