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Message: <blockquote data-quote="typo" data-source="post: 3141102" data-attributes="member: 83808">You are probably right that I would see more advantage with longer periods of use. I've not tried to measure the effective resolution of a Canon IS but I have both hand held and tripod mounted for a number of my binoculars. Unfortunately I've misplaced my notebook for now but from memory I get little difference with my 7x36 where hand held would be about 6.5 equivalent. Above that it very much depends on the balance of the model. An 8x42 might be as low as 6.5x or better than 7.5x. One 10x I have gets me over 9x hand held and another 6.5x. My 12x porro gives me about 10.5x hand held equivalent. So shake accounts for something between 8% and 35% loss in detail depending on magnification and most particularly the balance of binoculars.I don't know why the IS didn't appear to do much for me but even with the 10x42 I really don't think I was seeing the detail level of my best 10x42.David</blockquote>