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FWIW, I've found that a Nikon DK-21M magnifier such as found on the D300 will fit on Canon crop bodies such as my 40D (if you really want to be sure it will stay there put a little bit of double-stick tape in the grooves before putting it on the camera). I use this and a Katz Eye on my 40D, & it has really improved the viewfinder experience.



I do wear glasses for distance vision, but I'm lucky enough that 5 clicks to the left on the diopter wheel allows me to use the camera without them.