The HoodLoupe is a combination of a moulded rubber shade and magnifier for viewing the screens of digital cameras. The loupe is simply held against the back of the camera and in
environments where there is high ambient light it results in glare-free viewing to assess composition, focus and exposure. It may be worn around the neck or, particularly useful when shooting video with a D-SLR, fastened to the camera using an additional accessory. It has a +/-3 diopter lens to accommodate those with less than perfect vision, focus is adjusted in a manner similar to a binocular eye piece. The 'German glass optics' gives a 1:1 ratio for 'true LCD screen viewing'. It fits LCD screens up to 3 inches diagonal size.
That says it all, but not quite.
So why did I purchase the HoodLoupe?
You could say it is an expensive fashion accessory, to make you look like a "David Bailey".
I wear glasses which is a nuisance, with the diopter lens, something the cheap versions do not have; viewing the camera screen is so much more user friendly.
So the question you have to ask yourself is; do you really want to glue a plate to your very expensive, pride and joy, almost caused a divorce camera?
The HoodLoupe will give many years of service, with the cheaper version perhaps, but you will have a plate glued on the back of the camera and this will of course reduce the second hand value if you ever wish to sell it.
If you did want a semi-permanent attachment; for video applications; you can always purchase the Hoodman Hoodloupe Cinema Strap.
The Cinema Strap customer reviews are not flattering but remember this item is to suit all sizes of camera.
Nothing is perfect in this world, but the design of this loupe comes close; but at a very high price.
There is no more to be said, except you will not be disappointed with this accessory.
It is a pleasure to use, I only wish is that I bought it long ago.